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A026987
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026681.
0
1, 6, 35, 154, 613, 2882, 14995, 68730, 291606, 1378110, 7047087, 32801046, 143237183, 681449778, 3462931356, 16261134650, 72210836920, 345094694354, 1747534150303, 8253521588404, 37063741964059, 177681801860358, 897584067273979, 4256535683245074, 19269823577105032
OFFSET
1,2
CROSSREFS
Sequence in context: A078799 A203288 A026957 * A375248 A030532 A333800
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Oct 20 2019
STATUS
approved