A215289 - cp's OEIS frontend

A215289 Number of permutations of 0..floor((n*5-1)/2) on even squares of an n X 5 array such that each row and column of even squares is increasing.

n	a(n)
1	1
2	10
3	140
4	2100
5	60060
6	1051050
7	42882840
8	814773960
9	41227562376
10	824551247520
11	48236247979920
12	999179422441200
13	64899082486180800
14	1379105502831342000
15	96951116849043342600
16	2100607531729272423000
17	157112712418611824074200
18	3456479673209460129632400
19	271742147399231010918736320

[1, 10, 140, 2100, 60060, 1051050, 42882840, 814773960, 41227562376, 824551247520, 48236247979920, 999179422441200, 64899082486180800, 1379105502831342000, 96951116849043342600, 2100607531729272423000, 157112712418611824074200, 3456479673209460129632400, 271742147399231010918736320]

cp's OEIS Frontend

A215289 Number of permutations of 0..floor((n*5-1)/2) on even squares of an n X 5 array such that each row and column of even squares is increasing.

Table of values

List of values