A192714 - cp's OEIS frontend

A192714 Number of 13X2 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2n^2 (number of collections of 13 zero-sum 2-vectors with total modulus squared not more than 2n^2, ignoring vector and component permutations).

n	a(n)
1	2
2	6
3	19
4	55
5	140
6	331
7	732
8	1533
9	3055
10	5857
11	10824
12	19386
13	33743
14	57293
15	95044
16	154445
17	246197
18	385697
19	594416
20	902641
21	1351643
22	1998191
23	2918046
24	4213843
25	6019994
26	8515367
27	11930845
28	16568416
29	22815114
30	31168260
31	42253487
32	56871045

[2, 6, 19, 55, 140, 331, 732, 1533, 3055, 5857, 10824, 19386, 33743, 57293, 95044, 154445, 246197, 385697, 594416, 902641, 1351643, 1998191, 2918046, 4213843, 6019994, 8515367, 11930845, 16568416, 22815114, 31168260, 42253487, 56871045]

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List of values