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A026327
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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) = 4. Also a(n) = T(n,n-2), where T is the array in A026323.
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1
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1, 3, 10, 30, 90, 266, 783, 2295, 6710, 19580, 57057, 166101, 483210, 1405080, 4084590, 11872494, 34508997, 100313635, 291646580, 848102640, 2466916474, 7177785582, 20891443950, 60827142350, 177167486925, 516217883571, 1504692189588
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