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A026305 a(n) = T(2n,n-1), where T is the array in A026300. 0
1, 4, 20, 104, 560, 3080, 17199, 97120, 553146, 3171860, 18288127, 105922544, 615820400, 3591858480, 21008159700, 123169357728, 723659556026, 4259672761560, 25115352874780, 148302374872080, 876876653336922, 5191051724957736 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..22.

CROSSREFS

Sequence in context: A089382 A291089 A192619 * A195256 A131786 A061709

Adjacent sequences:  A026302 A026303 A026304 * A026306 A026307 A026308

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified September 23 19:03 EDT 2021. Contains 347617 sequences. (Running on oeis4.)