A225341 - cp's OEIS frontend

A225341 Number of nX5 -1,1 arrays such that the sum over i=1..n,j=1..5 of i*x(i,j) is zero, the sum of x(i,j) is zero, and rows are nondecreasing (number of ways to distribute 5-across galley oarsmen left-right at n fore-aft positions so that there are no turning moments on the ship).

n	a(n)
1	0
2	0
3	0
4	12
5	0
6	0
7	0
8	4508
9	0
10	0
11	0
12	2680534
13	0
14	0
15	0
16	1985837462
17	0
18	0
19	0
20	1663045511892
21	0
22	0
23	0
24	1506336601246000
25	0
26	0
27	0
28	1440828827246863370
29	0
30	0
31	0
32	1434551060282150636452
33	0
34	0
35	0
36	1472882578482323918604276
37	0
38	0
39	0

[0, 0, 0, 12, 0, 0, 0, 4508, 0, 0, 0, 2680534, 0, 0, 0, 1985837462, 0, 0, 0, 1663045511892, 0, 0, 0, 1506336601246000, 0, 0, 0, 1440828827246863370, 0, 0, 0, 1434551060282150636452, 0, 0, 0, 1472882578482323918604276, 0, 0, 0]

cp's OEIS Frontend

A225341 Number of nX5 -1,1 arrays such that the sum over i=1..n,j=1..5 of i*x(i,j) is zero, the sum of x(i,j) is zero, and rows are nondecreasing (number of ways to distribute 5-across galley oarsmen left-right at n fore-aft positions so that there are no turning moments on the ship).

Table of values

List of values