A309247 a(n) = Sum_{k=0..n} (p(n,k) mod 2), where p(n,k) = number of partitions of n into k parts.

1, 1, 2, 3, 3, 3, 5, 5, 6, 6, 8, 8, 9, 7, 11, 12, 11, 11, 13, 12, 9, 14, 12, 13, 13, 12, 14, 16, 16, 19, 16, 18, 21, 19, 24, 23, 21, 17, 23, 23, 24, 23, 26, 25, 25, 24, 28, 20, 25, 25, 28, 29, 27, 27, 29, 28, 35, 28, 30, 30, 29, 31, 32, 33, 30, 32, 36, 35, 35, 35, 40, 35, 41, 41, 38, 42, 43

Offset

0,3

Comments

Number of odd entries in row n of triangle of partition numbers (A008284, A072233).

Links

Table of n, a(n) for n=0..76.

Mathematica

Table[Sum[Mod[Length[IntegerPartitions[n, {k}]], 2], {k, 0, n}], {n, 0, 76}]

Crossrefs

Cf. A007306, A008284, A071754, A072233.

Sequence in context: A234337 A216391 A014202 * A238211 A338451 A145281

Adjacent sequences: A309244 A309245 A309246 * A309248 A309249 A309250

Keyword

nonn

Author

Ilya Gutkovskiy, Jul 18 2019

Status

approved