A026957 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026615.

1, 6, 35, 154, 613, 2362, 9028, 34510, 132241, 508210, 1958460, 7565906, 29292820, 113633930, 441579702, 1718642278, 6698377449, 26139863330, 102125977396, 399415127682, 1563614796608, 6126581578954, 24024810462810, 94281930087290, 370254213115948, 1454967778894282

Offset

1,2

Links

Table of n, a(n) for n=1..26.

Crossrefs

Sequence in context: A027985 A078799 A203288 * A026987 A030532 A333800

Adjacent sequences: A026954 A026955 A026956 * A026958 A026959 A026960

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 20 2019

Status

approved