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Search: id:A026328
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| A026328 |
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a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 2, s(n) = 5. Also a(n) = T(n,n-3), where T is the array in A026323. |
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| 1, 4, 15, 50, 161, 504, 1553, 4730, 14289, 42900, 128193, 381654, 1132950, 3355392, 9918990, 29278012, 86316259, 254227980, 748200145, 2200619806, 6469372932, 19011518480, 55853259800, 164055406320, 481804384035, 1414857108756, 4154663090529
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