A164869 n*A027642(n).

0, 2, 12, 3, 120, 5, 252, 7, 240, 9, 660, 11, 32760, 13, 84, 15, 8160, 17, 14364, 19, 6600, 21, 3036, 23, 65520, 25, 156, 27, 24360, 29, 429660, 31, 16320, 33, 204, 35, 69090840, 37, 228, 39, 541200, 41, 75852, 43, 30360, 45, 12972, 47, 2227680, 49, 3300, 51, 82680

Offset: 0

Author

Paul Curtz, Aug 29 2009

Keywords

• nonn

Crossrefs

Cf. A164877 (bisection).

Formula

a(n) = A164558(n) - A164555(n).

a(n) = A027642(n) * A001477(n).

Extensions

Extended by R. J. Mathar, Sep 03 2009