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A027224
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a(n) = Sum{T(n,k)*T(n,k+1), 0<=k<=n-1, T given by A026747.
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0
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1, 6, 24, 132, 500, 2728, 10324, 56651, 215323, 1191987, 4549786, 25420734, 97369588, 548884043, 2108335364, 11983465575, 46136052623, 264215445322
(list; graph; refs; listen; history; internal format)
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