A192699 - cp's OEIS frontend

A192699 Number of 2X4 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 2 zero-sum 4-vectors with total modulus squared not more than 2n^2, ignoring vector and component permutations).

n	a(n)
1	2
2	11
3	48
4	166
5	459
6	1125
7	2426
8	4871
9	9028
10	15919
11	26530
12	42795
13	66234
14	100066
15	146708
16	211012
17	295903
18	409009
19	555042
20	743702
21	980297
22	1279677
23	1648401
24	2106146
25	2660304
26	3336122
27	4142715
28	5114735
29	6259510
30	7619959
31	9210010

[2, 11, 48, 166, 459, 1125, 2426, 4871, 9028, 15919, 26530, 42795, 66234, 100066, 146708, 211012, 295903, 409009, 555042, 743702, 980297, 1279677, 1648401, 2106146, 2660304, 3336122, 4142715, 5114735, 6259510, 7619959, 9210010]

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Table of values

List of values