A192703 - cp's OEIS frontend

A192703 Number of 4X2 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 4 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	12
4	23
5	41
6	70
7	106
8	159
9	230
10	323
11	436
12	578
13	757
14	975
15	1232
16	1536
17	1889
18	2317
19	2797
20	3355
21	3994
22	4711
23	5523
24	6438
25	7465
26	8618
27	9888
28	11296
29	12839
30	14557
31	16398
32	18449
33	20689
34	23115
35	25758
36	28591
37	31673
38	34995
39	38586
40	42415
41	46528
42	50984
43	55687

[2, 6, 12, 23, 41, 70, 106, 159, 230, 323, 436, 578, 757, 975, 1232, 1536, 1889, 2317, 2797, 3355, 3994, 4711, 5523, 6438, 7465, 8618, 9888, 11296, 12839, 14557, 16398, 18449, 20689, 23115, 25758, 28591, 31673, 34995, 38586, 42415, 46528, 50984, 55687]

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List of values