A318591 - cp's OEIS frontend

A318591 Number of n-member subsets of [3*n] whose elements sum to a multiple of three.

n	a(n)
0	1
1	1
2	5
3	30
4	165
5	1001
6	6198
7	38760
8	245157
9	1562331
10	10015005
11	64512240
12	417226230
13	2707475148
14	17620076360
15	114955810530
16	751616304549
17	4923689695575
18	32308782871911
19	212327989773900
20	1397281501935165
21	9206478467531865
22	60727722660586800
23	400978991944396320

[1, 1, 5, 30, 165, 1001, 6198, 38760, 245157, 1562331, 10015005, 64512240, 417226230, 2707475148, 17620076360, 114955810530, 751616304549, 4923689695575, 32308782871911, 212327989773900, 1397281501935165, 9206478467531865, 60727722660586800, 400978991944396320]

cp's OEIS Frontend

A318591 Number of n-member subsets of [3*n] whose elements sum to a multiple of three.

Table of values

List of values