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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A192704 Number of 4X3 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 <= 2*n^2 (number of collections of 4 zero-sum 3-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).

Table of values

n a(n)
1 2
2 10
3 45
4 191
5 639
6 1925
7 5059
8 12197
9 27061
10 55957
11 109220
12 204227
13 361922
14 621790
15 1032797
16 1662821
17 2607574
18 4007507
19 5999290
20 8835971
21 12784870
22 18186200
23 25491781
24 35326689
25 48192368
26 65114102
27 87009836
28 115061673
29 150717188

List of values

[2, 10, 45, 191, 639, 1925, 5059, 12197, 27061, 55957, 109220, 204227, 361922, 621790, 1032797, 1662821, 2607574, 4007507, 5999290, 8835971, 12784870, 18186200, 25491781, 35326689, 48192368, 65114102, 87009836, 115061673, 150717188]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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