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A026992
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a(n) = Sum{T(n,k)*T(n,k+1)}, 0<=k<=n-1, T given by A026692.
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0
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1, 4, 15, 72, 385, 1740, 7200, 33892, 174369, 806288, 3477513, 16493280, 84033826, 393038584, 1732173866, 8260858904, 41899043017, 197360311690, 881681864213
(list; graph; refs; listen; history; internal format)
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