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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.

A192696 Number of 1X9 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 1 zero-sum 9-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 48
4 185
5 577
6 1570
7 3840
8 8577
9 17690
10 34551
11 63830
12 112942
13 192361
14 317003
15 506670
16 789958
17 1201985
18 1791493
19 2619745
20 3765999
21 5326330
22 7428899
23 10220081
24 13894828
25 18669185
26 24830564
27 32689442
28 42659878
29 55175883
30 70815315
31 90176720

List of values

[2, 10, 48, 185, 577, 1570, 3840, 8577, 17690, 34551, 63830, 112942, 192361, 317003, 506670, 789958, 1201985, 1791493, 2619745, 3765999, 5326330, 7428899, 10220081, 13894828, 18669185, 24830564, 32689442, 42659878, 55175883, 70815315, 90176720]

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

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