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A026957 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026615. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 27 12:24 EST 2023. Contains 359840 sequences. (Running on oeis4.)