A327023 - cp's OEIS frontend

A327023 Ordered set partitions of the set {1, 2, ..., 3*n} with all block sizes divisible by 3, irregular triangle T(n, k) for n >= 0 and 0 <= k < A000041(n), read by rows.

n	a(n)
0	1
1	1
2	1
3	20
4	1
5	168
6	1680
7	1
8	440
9	924
10	55440
11	369600
12	1
13	910
14	10010
15	300300
16	1261260
17	33633600
18	168168000
19	1
20	1632
21	37128
22	48620
23	1113840
24	24504480
25	17153136
26	326726400
27	2058376320
28	34306272000
29	137225088000

[1, 1, 1, 20, 1, 168, 1680, 1, 440, 924, 55440, 369600, 1, 910, 10010, 300300, 1261260, 33633600, 168168000, 1, 1632, 37128, 48620, 1113840, 24504480, 17153136, 326726400, 2058376320, 34306272000, 137225088000]

cp's OEIS Frontend

A327023 Ordered set partitions of the set {1, 2, ..., 3*n} with all block sizes divisible by 3, irregular triangle T(n, k) for n >= 0 and 0 <= k < A000041(n), read by rows.

Table of values

List of values