A291089 a(n) = A026520(2n+1).

1, 4, 20, 104, 556, 3032, 16778, 93872, 529684, 3008864, 17184188, 98577712, 567591142, 3278348608, 18986482250, 110217131168, 641125473092, 3736134109936, 21807240851480, 127469052615104, 746057665449076, 4371699398312704, 25644387465768860

Offset: 0

Author

N. J. A. Sloane, Aug 19 2017

Keywords

• nonn

Links

• Lars Blomberg, Table of n, a(n) for n = 0..500

Crossrefs

Cf. A026520, A291088.

Extensions

a(15)-a(22) from Lars Blomberg, Sep 01 2017