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A027316
a(n) = Sum_{k=0..m-1} T(n,k) * T(n,k+1), where m=n for n=0,1,2,3; m=2n for n >= 4; and T is given by A026082.
0
1, 4, 15, 70, 644, 5502, 46936, 402164, 3460536, 29885592, 258897792, 2248831350, 19579288052, 170814593158, 1492927792104, 13069310259850, 114576104658836, 1005775588360122, 8839355153926048, 77768991557179442, 684886480844420844, 6037008171432448154
OFFSET
1,2
CROSSREFS
Sequence in context: A367040 A356407 A366034 * A085349 A185133 A278640
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Oct 27 2019
STATUS
approved