A026159 T(4n,n), where T is the array in A026148.

1, 3, 29, 286, 2955, 31350, 338513, 3701268, 40849164, 454106770, 5077352709, 57037374596, 643249683466, 7278351281985, 82587176568765, 939405430122520, 10708295003335044, 122293746883319148, 1398985504993006671, 16027662449198124300, 183869540691211039945

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