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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.

A055609 Number of 3 X n binary matrices with no zero rows or columns, up to row and column permutation.

Table of values

n a(n)
1 1
2 5
3 17
4 42
5 91
6 180
7 328
8 565
9 930
10 1470
11 2248
12 3344
13 4849
14 6881
15 9579
16 13104
17 17649
18 23442
19 30736
20 39833
21 51074
22 64842
23 81574
24 101766
25 125959
26 154771
27 188883
28 229044
29 276085
30 330926
31 394558
32 468083
33 552696
34 649692
35 760482
36 886602
37 1029691
38 1191539
39 1374065
40 1579326

List of values

[1, 5, 17, 42, 91, 180, 328, 565, 930, 1470, 2248, 3344, 4849, 6881, 9579, 13104, 17649, 23442, 30736, 39833, 51074, 64842, 81574, 101766, 125959, 154771, 188883, 229044, 276085, 330926, 394558, 468083, 552696, 649692, 760482, 886602, 1029691, 1191539, 1374065, 1579326]

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

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