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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
A390416
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
