A225349 - cp's OEIS frontend

A225349 Number of 9Xn -1,1 arrays such that the sum over i=1..9,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 9 fore-aft positions so that there are no turning moments on the ship).

n	a(n)
1	0
2	181
3	0
4	6095
5	0
6	63121
7	0
8	364051
9	0
10	1478059
11	0
12	4749875
13	0
14	12917383
15	0
16	30996867
17	0
18	67483509
19	0
20	135917019
21	0
22	256859575
23	0
24	460336079
25	0
26	788783775
27	0
28	1300561813
29	0
30	2074066679
31	0
32	3212505371
33	0
34	4849371247
35	0
36	7154674999
37	0
38	10341975199
39	0

[0, 181, 0, 6095, 0, 63121, 0, 364051, 0, 1478059, 0, 4749875, 0, 12917383, 0, 30996867, 0, 67483509, 0, 135917019, 0, 256859575, 0, 460336079, 0, 788783775, 0, 1300561813, 0, 2074066679, 0, 3212505371, 0, 4849371247, 0, 7154674999, 0, 10341975199, 0]

cp's OEIS Frontend

A225349 Number of 9Xn -1,1 arrays such that the sum over i=1..9,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 9 fore-aft positions so that there are no turning moments on the ship).

Table of values

List of values