A318595 Number of n-member subsets of [7*n] whose elements sum to a multiple of seven.

1, 1, 13, 190, 2925, 46376, 749398, 12271518, 202927725, 3381098545, 56672074888, 954526728530, 16141841823510, 273897571557780, 4660989191504198, 79515468511191440, 1359472297966470765, 23287391568864135063, 399584727647019644125, 6866816177157320098000

Offset

0,3

Links

Alois P. Heinz, Table of n, a(n) for n = 0..804

Example

a(2) = 13: {1,6}, {1,13}, {2,5}, {2,12}, {3,4}, {3,11}, {4,10}, {5,9}, {6,8}, {7,14}, {8,13}, {9,12}, {10,11}.

Crossrefs

Column k=7 of A318557.

Sequence in context: A057801 A377771 A094736 * A055613 A123808 A103731

Adjacent sequences: A318592 A318593 A318594 * A318596 A318597 A318598

Keyword

nonn

Author

Alois P. Heinz, Aug 29 2018

Status

approved