A027330 - OEIS

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A027330

a(n) = Sum_{k=0..m} T(n,k) * T(n,k+1), where m=0 for n=1; m=n+1 for n >= 2; and T is given by A026148.

0

1, 6, 50, 394, 3120, 24922, 200676, 1627434, 13282008, 109014050, 899304906, 7452793766, 62019712684, 518052932358, 4342182907626, 36509428285466, 307859922637008, 2602876165613074, 22060637925756358, 187399432888840254, 1595268339755117256

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..21.

CROSSREFS

Sequence in context: A180880 A308860 A318162 * A090409 A212233 A180910

Adjacent sequences: A027327 A027328 A027329 * A027331 A027332 A027333

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 27 2019

STATUS

approved