A332015 Number of compositions (ordered partitions) of n into distinct heptagonal numbers.

1, 1, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 2, 6, 0, 0, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 2, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 0, 1, 2, 0, 0, 6, 24, 0, 2, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 0, 0, 0, 0, 0, 6, 25, 2

Offset

0,9

Links

Table of n, a(n) for n=0..82.

Eric Weisstein's World of Mathematics, Heptagonal Number

Index entries for sequences related to compositions

Example

a(26) = 6 because we have [18, 7, 1], [18, 1, 7], [7, 18, 1], [7, 1, 18], [1, 18, 7] and [1, 7, 18].

Crossrefs

Cf. A000566, A279012, A279280, A322799, A331843, A331844, A332007, A332014, A332016.

Sequence in context: A251570 A292241 A352727 * A173667 A241541 A086008

Adjacent sequences: A332012 A332013 A332014 * A332016 A332017 A332018

Keyword

nonn

Author

Ilya Gutkovskiy, Feb 04 2020

Status

approved