A225348 - cp's OEIS frontend

A225348 Number of 8Xn -1,1 arrays such that the sum over i=1..8,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 8 fore-aft positions so that there are no turning moments on the ship).

n	a(n)
1	8
2	77
3	410
4	1525
5	4508
6	11291
7	25056
8	50659
9	95130
10	168289
11	283338
12	457627
13	713374
14	1078615
15	1587974
16	2283803
17	3217102
18	4448769
19	6050622
20	8106883
21	10715232
22	13988475
23	18055740
24	23064277
25	29180742
26	36593245
27	45512628
28	56174753
29	68841880

[8, 77, 410, 1525, 4508, 11291, 25056, 50659, 95130, 168289, 283338, 457627, 713374, 1078615, 1587974, 2283803, 3217102, 4448769, 6050622, 8106883, 10715232, 13988475, 18055740, 23064277, 29180742, 36593245, 45512628, 56174753, 68841880]

cp's OEIS Frontend

A225348 Number of 8Xn -1,1 arrays such that the sum over i=1..8,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 8 fore-aft positions so that there are no turning moments on the ship).

Table of values

List of values