A225351 - cp's OEIS frontend

A225351 Number of 11Xn -1,1 arrays such that the sum over i=1..11,j=1..n of i*x(i,j) is zero, the sum of x(i,j) is zero, and rows are nondecreasing (number of ways to distribute n-across galley oarsmen left-right at 11 fore-aft positions so that there are no turning moments on the ship).

n	a(n)
1	0
2	1113
3	0
4	103583
5	0
6	2102597
7	0
8	20044255
9	0
10	121558241
11	0
12	545572495
13	0
14	1975264495
15	0
16	6087969941
17	0
18	16555930825
19	0
20	40733826807
21	0
22	92339940289
23	0
24	195519292147
25	0
26	390766431925
27	0
28	743286869427
29	0
30	1354483437063
31	0

[0, 1113, 0, 103583, 0, 2102597, 0, 20044255, 0, 121558241, 0, 545572495, 0, 1975264495, 0, 6087969941, 0, 16555930825, 0, 40733826807, 0, 92339940289, 0, 195519292147, 0, 390766431925, 0, 743286869427, 0, 1354483437063, 0]

cp's OEIS Frontend

A225351 Number of 11Xn -1,1 arrays such that the sum over i=1..11,j=1..n of i*x(i,j) is zero, the sum of x(i,j) is zero, and rows are nondecreasing (number of ways to distribute n-across galley oarsmen left-right at 11 fore-aft positions so that there are no turning moments on the ship).

Table of values

List of values