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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.

A360420 a(n) = the number of Z-frame polyominoes with n cells, reduced for symmetry.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 2
6 6
7 10
8 19
9 27
10 43
11 58
12 85
13 105
14 143
15 175
16 226
17 266
18 334
19 386
20 475
21 534
22 641
23 717
24 854
25 933
26 1092
27 1187
28 1385
29 1482
30 1713
31 1820
32 2091
33 2203
34 2511
35 2637
36 2998
37 3110
38 3516
39 3647
40 4118
41 4226
42 4761
43 4865
44 5461
45 5576
46 6221
47 6319
48 7088
49 7138
50 7953

List of values

[0, 0, 0, 1, 2, 6, 10, 19, 27, 43, 58, 85, 105, 143, 175, 226, 266, 334, 386, 475, 534, 641, 717, 854, 933, 1092, 1187, 1385, 1482, 1713, 1820, 2091, 2203, 2511, 2637, 2998, 3110, 3516, 3647, 4118, 4226, 4761, 4865, 5461, 5576, 6221, 6319, 7088, 7138, 7953]

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

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