A056939 - cp's OEIS frontend

A056939 Array read by antidiagonals: number of antichains (or order ideals) in the poset 3mn or plane partitions with rows <= m, columns <= n and entries <= 3.

n	a(n)
0	1
1	1
2	1
3	1
4	4
5	1
6	1
7	10
8	10
9	1
10	1
11	20
12	50
13	20
14	1
15	1
16	35
17	175
18	175
19	35
20	1
21	1
22	56
23	490
24	980
25	490
26	56
27	1
28	1
29	84
30	1176
31	4116
32	4116
33	1176
34	84
35	1
36	1
37	120
38	2520
39	14112
40	24696
41	14112
42	2520
43	120
44	1
45	1
46	165
47	4950
48	41580
49	116424
50	116424
51	41580
52	4950
53	165
54	1

[1, 1, 1, 1, 4, 1, 1, 10, 10, 1, 1, 20, 50, 20, 1, 1, 35, 175, 175, 35, 1, 1, 56, 490, 980, 490, 56, 1, 1, 84, 1176, 4116, 4116, 1176, 84, 1, 1, 120, 2520, 14112, 24696, 14112, 2520, 120, 1, 1, 165, 4950, 41580, 116424, 116424, 41580, 4950, 165, 1]

cp's OEIS Frontend

A056939 Array read by antidiagonals: number of antichains (or order ideals) in the poset 3mn or plane partitions with rows <= m, columns <= n and entries <= 3.

Table of values

List of values

cp's OEIS Frontend

A056939 Array read by antidiagonals: number of antichains (or order ideals) in the poset 3*m*n or plane partitions with rows <= m, columns <= n and entries <= 3.

Table of values

List of values

A056939 Array read by antidiagonals: number of antichains (or order ideals) in the poset 3mn or plane partitions with rows <= m, columns <= n and entries <= 3.