A138529 a(n) = Sum_{k=1..n} A138528(k).

1, 2, 3, 5, 6, 8, 11, 12, 14, 17, 21, 26, 27, 29, 32, 36, 41, 47, 48, 50, 53, 57, 62, 68, 75, 83, 84, 86, 89, 93, 98, 104, 111, 119, 128, 138, 149, 150, 152, 155, 159, 164, 170, 177, 185, 194, 204, 215, 227, 228, 230, 233, 237, 242, 248, 255, 263, 272, 282, 293, 305, 318, 332, 333, 335, 338

Offset

1,2

Links

Ivan Neretin, Table of n, a(n) for n = 1..10000

Mathematica

Accumulate@Nest[Flatten@Join[{1}, Range[Accumulate@#]] &, {1}, 4] (* Ivan Neretin, Jan 30 2018 *)

Crossrefs

Cf. A138528.

Sequence in context: A028966 A028767 A268226 * A266409 A035057 A005099

Adjacent sequences: A138526 A138527 A138528 * A138530 A138531 A138532

Keyword

easy,nonn

Author

Leroy Quet, Mar 23 2008

Status

approved