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A026989
a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026681.
0
1, 14, 115, 660, 3805, 20520, 109779, 551774, 2921313, 14482320, 71576096, 349292330, 1804636693, 8745745676, 42107640345, 203559063050, 1040682784201, 5002217935308, 23823427871991, 114772726273528, 583453635620973, 2795288971320092, 13246283464422706, 63736681240596050
OFFSET
3,2
CROSSREFS
Sequence in context: A027204 A200037 A026959 * A204240 A178258 A121783
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Oct 21 2019
STATUS
approved