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A026974
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a(n) = Sum{T(n,k)*T(n,k+3)}, 0<=k<=n-3, T given by A026648.
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0
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1, 12, 77, 450, 2154, 11592, 51060, 261720, 1106790, 5562216, 23051943, 114491286, 468950860, 2313509520, 9409147640, 46221336720, 187136146566, 916762621320
(list; graph; refs; listen; history; internal format)
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