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

Author

Alois P. Heinz, Aug 29 2018

Keywords

• nonn

Examples

			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}.
		

Links

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

Crossrefs

Column k=7 of A318557.