A192713 - cp's OEIS frontend

A192713 Number of 12X2 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 12 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	53
5	133
6	310
7	669
8	1371
9	2684
10	5037
11	9125
12	16021
13	27343
14	45523
15	74103
16	118121
17	184828
18	284258
19	430192
20	641623
21	944008
22	1371445
23	1968786
24	2795325
25	3927604
26	5465114
27	7534219
28	10297413
29	13958709
30	18775675
31	25067921
32	33235421

[2, 6, 19, 53, 133, 310, 669, 1371, 2684, 5037, 9125, 16021, 27343, 45523, 74103, 118121, 184828, 284258, 430192, 641623, 944008, 1371445, 1968786, 2795325, 3927604, 5465114, 7534219, 10297413, 13958709, 18775675, 25067921, 33235421]

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Table of values

List of values