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A027210
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a(n) = Sum{T(n,k)*T(n,k+3), 0<=k<=n-3, T given by A026725.
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0
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1, 9, 57, 298, 1545, 7126, 34603, 151633, 714481, 3049328, 14131926, 59385159, 272409611, 1133433579, 5163641033, 21341122875, 96751092786, 397978832144
(list; graph; refs; listen; history; internal format)
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