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A027288
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a(n) = Sum{T(n,k)*T(n,k+1)}, 0<=k<=[ n/2 ], T given by A026009.
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0
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1, 4, 12, 46, 145, 552, 1820, 6918, 23562, 89645, 312664, 1191885, 4232345, 16170728, 58229100, 222997812, 811985790, 3116622123, 11451785640, 44047806725, 163072988442, 628465576101
(list; graph; refs; listen; history; internal format)
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