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A026992
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026692.
0
1, 4, 15, 72, 385, 1740, 7200, 33892, 174369, 806288, 3477513, 16493280, 84033826, 393038584, 1732173866, 8260858904, 41899043017, 197360311690, 881681864213, 4220575766976, 21345258947469, 101030588041560, 455632655173002, 2186903113868104, 11036726477564350, 52421656397330054
OFFSET
1,2
CROSSREFS
Sequence in context: A085349 A185133 A278640 * A039764 A171005 A303229
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Oct 21 2019
STATUS
approved