A192707 - cp's OEIS frontend

A192707 Number of 7X2 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 7 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	17
4	39
5	85
6	167
7	309
8	546
9	919
10	1486
11	2338
12	3564
13	5300
14	7703
15	11016
16	15451
17	21303
18	28978
19	38908
20	51626
21	67686
22	87827
23	112967
24	144076
25	182028
26	228322
27	284414
28	351962
29	432504
30	528554
31	642212
32	776430
33	933563
34	1117263
35	1331217
36	1579771
37	1865945

[2, 6, 17, 39, 85, 167, 309, 546, 919, 1486, 2338, 3564, 5300, 7703, 11016, 15451, 21303, 28978, 38908, 51626, 67686, 87827, 112967, 144076, 182028, 228322, 284414, 351962, 432504, 528554, 642212, 776430, 933563, 1117263, 1331217, 1579771, 1865945]

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Table of values

List of values