“爬楼梯”问题
203——a LinearRecurrence[{0, 6, 0, -1}, {3, 7, 11, 39}, n]
3, 7, 11, 39, 63, 227, 367, 1323, 2139, 7711, 12467, 44943,
203——b LinearRecurrence[{0, 6, 0, -1}, {1, 9, 15, 55}, n]
1, 9, 15, 55, 89, 321, 519, 1871, 3025, 10905, 17631, 63559,
204——a LinearRecurrence[{0, 6, 0, -1}, {4, 6, 18, 32}, n]
4, 6, 18, 32, 104, 186, 606, 1084, 3532, 6318, 20586, 36824,
204——b LinearRecurrence[{0, 6, 0, -1}, {3, 7, 25, 45}, n]
3, 7, 25, 45, 147, 263, 857, 1533, 4995, 8935, 29113, 52077,
205——a LinearRecurrence[{0, 6, 0, -1}, {4, 10, 14, 56}, n]
4, 10, 14, 56, 80, 326, 466, 1900, 2716, 11074, 15830, 64544,
205——b LinearRecurrence[{0, 6, 0, -1}, {1, 13, 19, 79}, n]
1, 13, 19, 79, 113, 461, 659, 2687, 3841, 15661, 22387, 91279,
207——a LinearRecurrence[{0, 6, 0, -1}, {2, 4, 8, 22}, n]
2, 4, 8, 22, 46, 128, 268, 746, 1562, 4348, 9104, 25342, 53062,
207——b LinearRecurrence[{0, 6, 0, -1}, {1, 5, 11, 31}, n]
1, 5, 11, 31, 65, 181, 379, 1055, 2209, 6149, 12875, 35839, 75041, |