A215294 - cp's OEIS frontend

A215294 Number of permutations of 0..floor((n*3-2)/2) on odd squares of an n X 3 array such that each row and column of odd squares is increasing.

n	a(n)
1	1
2	3
3	6
4	30
5	70
6	420
7	1050
8	6930
9	18018
10	126126
11	336336
12	2450448
13	6651216
14	49884120
15	137181330
16	1051723530
17	2921454250
18	22787343150
19	63804560820
20	504636071940
21	1422156202740
22	11377249621920
23	32235540595440
24	260363981732400

[1, 3, 6, 30, 70, 420, 1050, 6930, 18018, 126126, 336336, 2450448, 6651216, 49884120, 137181330, 1051723530, 2921454250, 22787343150, 63804560820, 504636071940, 1422156202740, 11377249621920, 32235540595440, 260363981732400]

cp's OEIS Frontend

A215294 Number of permutations of 0..floor((n*3-2)/2) on odd squares of an n X 3 array such that each row and column of odd squares is increasing.

Table of values

List of values