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A026159 T(4n,n), where T is the array in A026148. 0
1, 3, 29, 286, 2955, 31350, 338513, 3701268, 40849164, 454106770, 5077352709, 57037374596, 643249683466, 7278351281985, 82587176568765, 939405430122520, 10708295003335044, 122293746883319148, 1398985504993006671, 16027662449198124300, 183869540691211039945 (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: A124263 A180828 A026130 * A025186 A140780 A268493

Adjacent sequences:  A026156 A026157 A026158 * A026160 A026161 A026162

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

a(7) corrected and more terms from Sean A. Irvine, Sep 18 2019

STATUS

approved

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Last modified December 1 09:28 EST 2020. Contains 338833 sequences. (Running on oeis4.)