A273939 a(0) = 1, a(1) = 2; for k>0, a(2*k) = k*a(2*k-1) + a(2*k-2), a(2*k+1) = a(2*k) + a(2*k-1).

1, 2, 3, 5, 13, 18, 67, 85, 407, 492, 2867, 3359, 23021, 26380, 207681, 234061, 2080169, 2314230, 22908239, 25222469, 275132929, 300355398, 3579042307, 3879397705, 50131814767, 54011212472, 752277576903, 806288789375, 12040320628153

Offset: 0

Author

Seiichi Manyama, Sep 22 2016

Keywords

• nonn

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..896

Crossrefs

Cf. A056921, A056922, A058798.

Formula

a(n) = A056921(n) + A056922(n).