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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.

A230880 Number of 2-packed matrices with exactly n nonzero entries.

Table of values

n a(n)
0 1
1 2
2 8
3 80
4 1120
5 20544
6 463744
7 12422656
8 384947200
9 13541822464
10 533049493504
11 23210958688256
12 1107652218822656
13 57482801016422400
14 3223015475535380480
15 194157345516262588416
16 12505948470244176953344
17 857670052436844788318208
18 62395270194815987194789888

List of values

[1, 2, 8, 80, 1120, 20544, 463744, 12422656, 384947200, 13541822464, 533049493504, 23210958688256, 1107652218822656, 57482801016422400, 3223015475535380480, 194157345516262588416, 12505948470244176953344, 857670052436844788318208, 62395270194815987194789888]

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

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