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A152415 a(n) = A166709(n) + 1. 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

LINKS

Table of n, a(n) for n=1..55.

CROSSREFS

Sequence in context: A113118 A287636 A032417 * A175826 A304630 A073470

Adjacent sequences:  A152412 A152413 A152414 * A152416 A152417 A152418

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 24 2009

STATUS

approved

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Last modified August 26 05:47 EDT 2019. Contains 326329 sequences. (Running on oeis4.)