A215784 - cp's OEIS frontend

A215784 Number of permutations of 0..floor((n*6-1)/2) on even squares of an n X 6 array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.

n	a(n)
1	1
2	2
3	12
4	29
5	189
6	458
7	2988
8	7241
9	47241
10	114482
11	746892
12	1809989
13	11808549
14	28616378
15	186696108
16	452432081
17	2951712081
18	7153064162
19	46667304972
20	113091730349
21	737821743309
22	1788008493098
23	11665145978028
24	28268860698521

[1, 2, 12, 29, 189, 458, 2988, 7241, 47241, 114482, 746892, 1809989, 11808549, 28616378, 186696108, 452432081, 2951712081, 7153064162, 46667304972, 113091730349, 737821743309, 1788008493098, 11665145978028, 28268860698521]

cp's OEIS Frontend

A215784 Number of permutations of 0..floor((n*6-1)/2) on even squares of an n X 6 array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.

Table of values

List of values