A225346 - cp's OEIS frontend

A225346 Number of 6Xn -1,1 arrays such that the sum over i=1..6,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 6 fore-aft positions so that there are no turning moments on the ship).

n	a(n)
1	0
2	15
3	0
4	107
5	0
6	397
7	0
8	1081
9	0
10	2399
11	0
12	4675
13	0
14	8273
15	0
16	13641
17	0
18	21267
19	0
20	31731
21	0
22	45637
23	0
24	63697
25	0
26	86635
27	0
28	115291
29	0
30	150513
31	0
32	193269
33	0
34	244527
35	0
36	305383
37	0
38	376929
39	0
40	460389
41	0
42	556975
43	0
44	668043
45	0
46	794921
47	0
48	939097
49	0
50	1102023
51	0
52	1285311

[0, 15, 0, 107, 0, 397, 0, 1081, 0, 2399, 0, 4675, 0, 8273, 0, 13641, 0, 21267, 0, 31731, 0, 45637, 0, 63697, 0, 86635, 0, 115291, 0, 150513, 0, 193269, 0, 244527, 0, 305383, 0, 376929, 0, 460389, 0, 556975, 0, 668043, 0, 794921, 0, 939097, 0, 1102023, 0, 1285311]

cp's OEIS Frontend

A225346 Number of 6Xn -1,1 arrays such that the sum over i=1..6,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 6 fore-aft positions so that there are no turning moments on the ship).

Table of values

List of values