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A026993
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a(n) = Sum{T(n,k)*T(n,k+2)}, 0<=k<=n-2, T given by A026692.
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0
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1, 6, 32, 180, 984, 4606, 22689, 114992, 567129, 2576582, 12586319, 63131004, 305635176, 1384074886, 6739962365, 33708050180, 162468169385, 737652413014
(list; graph; refs; listen; history; internal format)
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