A390878 Convolution of A000041 and A237271.

1, 2, 5, 8, 15, 23, 38, 56, 87, 125, 183, 256, 363, 498, 688, 926, 1252, 1661, 2207, 2889, 3786, 4900, 6339, 8122, 10397, 13201, 16741, 21082, 26510, 33142, 41362, 51360, 63669, 78575, 96801, 118791, 145520, 177645, 216490, 263001, 318967, 385756, 465756

Offset

1,2

Comments

Conjecture: a(n) is the total number of 2-dense sublists of divisors of the positive integers whose divisors are the parts of the partitions of n.

Links

Table of n, a(n) for n=1..43.

Crossrefs

Row sums of A390877.

Cf. A000041, A174973 (2-dense numbers), A176206, A196020, A221529, A235791, A236104, A237270, A237271, A237591, A237593, A245092, A262626, A336811, A384222, A384931, A390880.

Sequence in context: A121641 A349796 A058884 * A073335 A239258 A362864

Adjacent sequences: A390875 A390876 A390877 * A390879 A390880 A390881

Keyword

nonn

Author

Omar E. Pol, Nov 27 2025

Extensions

More terms from Sean A. Irvine, Jan 08 2026

Status

approved