A225306 - cp's OEIS frontend

A225306 Number of nX5 -1,1 arrays such that the sum over i=1..n,j=1..5 of i*x(i,j) is zero and rows are nondecreasing (ways to put 5 thrusters pointing east or west at each of n positions 1..n distance from the hinge of a south-pointing gate without turning the gate).

n	a(n)
1	0
2	0
3	12
4	52
5	0
6	0
7	5304
8	26498
9	0
10	0
11	3670280
12	19472528
13	0
14	0
15	3059952646
16	16735288748
17	0
18	0
19	2821236602612
20	15715467775786
21	0
22	0
23	2770728141476684
24	15624859528160442
25	0
26	0
27	2841704521905480868
28	16166720093745817028
29	0
30	0

[0, 0, 12, 52, 0, 0, 5304, 26498, 0, 0, 3670280, 19472528, 0, 0, 3059952646, 16735288748, 0, 0, 2821236602612, 15715467775786, 0, 0, 2770728141476684, 15624859528160442, 0, 0, 2841704521905480868, 16166720093745817028, 0, 0]

cp's OEIS Frontend

A225306 Number of nX5 -1,1 arrays such that the sum over i=1..n,j=1..5 of i*x(i,j) is zero and rows are nondecreasing (ways to put 5 thrusters pointing east or west at each of n positions 1..n distance from the hinge of a south-pointing gate without turning the gate).

Table of values

List of values