A192700 - cp's OEIS frontend

A192700 Number of 2X5 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 5-vectors with total modulus squared not more than 2n^2, ignoring vector and component permutations).

n	a(n)
1	2
2	13
3	75
4	361
5	1355
6	4257
7	11487
8	28113
9	62690
10	130088
11	253378
12	470284
13	832594
14	1423302
15	2347627
16	3764623
17	5870541
18	8958955
19	13369172
20	19590712
21	28190894
22	39941879
23	55749068
24	76863446
25	104549377
26	140705757
27	187241581
28	246861965

[2, 13, 75, 361, 1355, 4257, 11487, 28113, 62690, 130088, 253378, 470284, 832594, 1423302, 2347627, 3764623, 5870541, 8958955, 13369172, 19590712, 28190894, 39941879, 55749068, 76863446, 104549377, 140705757, 187241581, 246861965]

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Table of values

List of values