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A026122
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a(n) = number of (s(0),s(1),...,s(n)) such that every s(i) is a nonnegative integer, s(0) = 1, s(n) = 1, |s(1) - s(0)| = 1, |s(i) - s(i-1)| <= 1 for i >= 2. Also a(n) = T(n,n), where T is the array in A026120.
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3
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2, 4, 11, 28, 74, 196, 525, 1416, 3846, 10508, 28864, 79664, 220818, 614460, 1715874, 4807008, 13506534, 38052972, 107477319, 304261404, 863188662, 2453737132, 6988033949, 19935797080, 56966012730, 163026450132, 467219178549, 1340810339036
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