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A026967
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026637.
9
1, 4, 24, 90, 365, 1376, 5272, 20098, 77016, 295836, 1139834, 4402490, 17042341, 66101848, 256838544, 999512058, 3895191476, 15199297796, 59377405654, 232208188726, 908978576496, 3561356276424, 13964734085774, 54799750800530, 215193550759630, 845596666261036
OFFSET
1,2
CROSSREFS
Sequence in context: A097875 A212681 A026694 * A026977 A026952 A222670
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Oct 20 2019
STATUS
approved