A152415 a(n) = A166709(n) + 1.

2, 4, 6, 10, 15, 21, 26, 33, 40, 50, 57, 69, 79, 93, 106, 116, 129, 145, 158, 172, 193, 212, 232, 254, 277, 298, 320, 340, 367, 397, 420, 443, 474, 501, 534, 562, 593, 629, 666, 692, 727, 760, 795, 833, 869, 901, 937, 980, 1029, 1071, 1115, 1160, 1209, 1249, 1299

Offset: 1

Author

N. J. A. Sloane, Oct 24 2009

Keywords

• nonn

Comments

This takes the empty sum into account. Suggested by M. F. Hasler.