A006366 - cp's OEIS frontend

A006366 Number of cyclically symmetric plane partitions in the n-cube; also number of 2n X 2n half-turn symmetric alternating sign matrices divided by number of n X n alternating sign matrices.

n	a(n)
0	1
1	2
2	5
3	20
4	132
5	1452
6	26741
7	826540
8	42939620
9	3752922788
10	552176360205
11	136830327773400
12	57125602787130000
13	40191587143536420000
14	47663133295107416936400
15	95288872904963020131203520
16	321195665986577042490185260608

[1, 2, 5, 20, 132, 1452, 26741, 826540, 42939620, 3752922788, 552176360205, 136830327773400, 57125602787130000, 40191587143536420000, 47663133295107416936400, 95288872904963020131203520, 321195665986577042490185260608]

cp's OEIS Frontend

A006366 Number of cyclically symmetric plane partitions in the n-cube; also number of 2n X 2n half-turn symmetric alternating sign matrices divided by number of n X n alternating sign matrices.

Table of values

List of values