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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.

A360419 a(n) = the number of U-frame polyominoes with n cells, reduced for symmetry.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 1
6 2
7 5
8 9
9 16
10 24
11 37
12 50
13 71
14 93
15 121
16 151
17 192
18 231
19 285
20 338
21 398
22 470
23 548
24 626
25 723
26 827
27 924
28 1056
29 1175
30 1314
31 1454
32 1629
33 1763
34 1985
35 2138
36 2356
37 2540
38 2820
39 2976
40 3305
41 3491
42 3834
43 4039
44 4441
45 4613
46 5103
47 5291
48 5775
49 5999
50 6572

List of values

[0, 0, 0, 0, 1, 2, 5, 9, 16, 24, 37, 50, 71, 93, 121, 151, 192, 231, 285, 338, 398, 470, 548, 626, 723, 827, 924, 1056, 1175, 1314, 1454, 1629, 1763, 1985, 2138, 2356, 2540, 2820, 2976, 3305, 3491, 3834, 4039, 4441, 4613, 5103, 5291, 5775, 5999, 6572]

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

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