A125023 Partial sums of A001372.

1, 2, 5, 12, 31, 78, 208, 551, 1502, 4117, 11435, 31926, 89829, 253727, 719926, 2048919, 5848543, 16732592, 47973762, 137788720, 396393362, 1141962118, 3294080424, 9512949813, 27501182865, 79579492065, 230478715333

Offset: 0

Author

Jonathan Vos Post, Nov 15 2006

Keywords

• easy
• nonn

Crossrefs

Cf. A001372, A125024.

Formula

a(n) = Sum_{i=0..n} A001372(i).

Extensions

More terms from R. J. Mathar, Sep 23 2007