A318431 - cp's OEIS frontend

A318431 Number of n-element subsets of [3n] whose elements sum to a multiple of n.

n	a(n)
0	1
1	3
2	6
3	30
4	126
5	603
6	3084
7	16614
8	91998
9	520779
10	3004206
11	17594250
12	104308092
13	624801960
14	3775722348
15	22991162130
16	140928103134
17	868886416869
18	5384796884934
19	33525472069566
20	209592226792326
21	1315211209647435
22	8281053081282900
23	52301607644921262

[1, 3, 6, 30, 126, 603, 3084, 16614, 91998, 520779, 3004206, 17594250, 104308092, 624801960, 3775722348, 22991162130, 140928103134, 868886416869, 5384796884934, 33525472069566, 209592226792326, 1315211209647435, 8281053081282900, 52301607644921262]

cp's OEIS Frontend

A318431 Number of n-element subsets of [3n] whose elements sum to a multiple of n.

Table of values

List of values