A192698 - cp's OEIS frontend

A192698 Number of 2X3 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 3-vectors with total modulus squared not more than 2n^2, ignoring vector and component permutations).

n	a(n)
1	2
2	8
3	20
4	54
5	104
6	190
7	323
8	529
9	795
10	1181
11	1653
12	2297
13	3088
14	4119
15	5307
16	6804
17	8518
18	10618
19	13029
20	15955
21	19160
22	22996
23	27203
24	32102
25	37584
26	43811
27	50621
28	58445
29	66858
30	76327
31	86710
32	98294
33	110610
34	124474
35	139222
36	155502
37	173011
38	192273
39	212726

[2, 8, 20, 54, 104, 190, 323, 529, 795, 1181, 1653, 2297, 3088, 4119, 5307, 6804, 8518, 10618, 13029, 15955, 19160, 22996, 27203, 32102, 37584, 43811, 50621, 58445, 66858, 76327, 86710, 98294, 110610, 124474, 139222, 155502, 173011, 192273, 212726]

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Table of values

List of values