第1组 Rn=24, 29, 82, 193, 468, 1129, 2726, 6581, ... 的通解公式,
\(a_n=\frac{(48+5\sqrt{2})(1+\sqrt{2})^{n}+(48-5\sqrt{2})(1-\sqrt{2})^{n}}{4}\)
第2组 Rn=26, 41, 108, 257, 622, 1501, 3624, 8749, ... 的通解公式,
\(a_n=\frac{(52+15\sqrt{2})(1+\sqrt{2})^{n}+(52-15\sqrt{2})(1-\sqrt{2})^{n}}{4}\)
第3组 Rn=11, 48, 107, 262, 631, 1524, 3679, 8882, ... 的通解公式,
\(a_n=\frac{(52-15\sqrt{2})(1+\sqrt{2})^{n}+(52+15\sqrt{2})(1-\sqrt{2})^{n}}{4}\)
第4组 Rn=19, 62, 143, 348, 839, 2026, 4891, 11808, ... 的通解公式,
\(a_n=\frac{(48-5\sqrt{2})(1+\sqrt{2})^{n}+(48+5\sqrt{2})(1-\sqrt{2})^{n}}{4}\)
第1,2,3,4组可以统一用“爬楼梯”按钮,在这里:a(n)=2*a(n-1)+a(n-2)
这公式已经很好啦: LinearRecurrence[{2, 1}, {a(1), a(2)}, n] |