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A027318
a(n) = Sum_{k=0..m-3} T(n,k) * T(n,k+2), where m=n for n=0,1,2,3; m=2n for n >= 4; and T is given by A026082.
0
1, 42, 420, 3786, 33648, 297940, 2633872, 23265744, 205446960, 1814136746, 16021697220, 141535810130, 1250763720312, 11057433981126, 97794407702052, 865284559977150, 7659315417653664, 67827407480624862, 600898634852988364, 5325658497658529790
OFFSET
3,2
CROSSREFS
Sequence in context: A114928 A364943 A127545 * A251425 A242144 A242145
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Oct 27 2019
STATUS
approved