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比如180楼的结果用MATHEMATICA可以这样得出:
- LinearRecurrence[{0, 6, 0, -1}, {1, 2, 4, 11}, 50]^2 - 1
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\[\{0,3,15,120,528,4095,17955,139128,609960,4726275,20720703,160554240,703893960,5454117903,23911673955,185279454480,812293020528,6294047334435,27594051024015,213812329916328,937385441796000,7263325169820735,31843510970040003,246739243443988680,1081741987539564120,8381870951925794403,36747384065375140095,284736873122033021040,1248329316235215199128,9672671815197196920975,42406449367931941630275,328586104843582662292128,1440570949193450800230240,11162254892866613321011395,48937005823209395266197903,379188080252621270252095320,1662417627039925988250498480,12881232473696256575250229503,56473262313534274205250750435,437582716025420102288255707800,1918428501033125396990275016328,14864931112390587221225443835715,65170095772812729223464099804735,504970075105254545419376834706528,2213864827774599668200789118344680,17154117622466263957037586936186255,75206234048563575989603365923914403,582735029088747719993858578995626160,2554798092823386983978313652294745040,19795836871394956215834154098915103203\}\] |
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