A225352 - cp's OEIS frontend

A225352 Number of 12Xn -1,1 arrays such that the sum over i=1..12,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 12 fore-aft positions so that there are no turning moments on the ship).

n	a(n)
1	58
2	2837
3	47990
4	437763
5	2680534
6	12439855
7	47084448
8	152452967
9	436320984
10	1129965973
11	2694285574
12	5993361143
13	12566218452
14	25037146431
15	47716202440
16	87454967053
17	154837885246
18	265807450011
19	443841357932
20	722822838305

[58, 2837, 47990, 437763, 2680534, 12439855, 47084448, 152452967, 436320984, 1129965973, 2694285574, 5993361143, 12566218452, 25037146431, 47716202440, 87454967053, 154837885246, 265807450011, 443841357932, 722822838305]

cp's OEIS Frontend

A225352 Number of 12Xn -1,1 arrays such that the sum over i=1..12,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 12 fore-aft positions so that there are no turning moments on the ship).

Table of values

List of values