cp's OEIS Frontend

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.

A192705 Number of 5X2 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 5 zero-sum 2-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 6
3 14
4 29
5 56
6 101
7 166
8 267
9 407
10 604
11 865
12 1211
13 1659
14 2236
15 2956
16 3861
17 4949
18 6299
19 7906
20 9849
21 12120
22 14817
23 17958
24 21641
25 25859
26 30753
27 36318
28 42732
29 49917
30 58116
31 67296
32 77693
33 89219
34 102175
35 116527
36 132515
37 150117
38 169602
39 191013
40 214662

List of values

[2, 6, 14, 29, 56, 101, 166, 267, 407, 604, 865, 1211, 1659, 2236, 2956, 3861, 4949, 6299, 7906, 9849, 12120, 14817, 17958, 21641, 25859, 30753, 36318, 42732, 49917, 58116, 67296, 77693, 89219, 102175, 116527, 132515, 150117, 169602, 191013, 214662]

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

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