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A026294 T(4n,n), where T is the array in A026268. 0
1, 3, 27, 266, 2743, 29068, 313633, 3427358, 37810605, 420193609, 4696967294, 52753182426, 594829939672, 6729488070844, 76349568744149, 868359048628146, 9897485221142239, 113024337104850132, 1292850211089736299, 14810711124377556034, 169898355365054443380 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..20.

CROSSREFS

Sequence in context: A163474 A235373 A279658 * A199688 A275998 A098401

Adjacent sequences:  A026291 A026292 A026293 * A026295 A026296 A026297

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Sep 24 2019

STATUS

approved

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Last modified July 4 03:54 EDT 2022. Contains 355063 sequences. (Running on oeis4.)