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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.

A346800 Number of fixed polyominoes with n cells that have a diagonal axis of symmetry going from lower left to upper right.

Table of values

n a(n)
1 1
2 0
3 2
4 1
5 5
6 4
7 16
8 13
9 54
10 46
11 186
12 167
13 660
14 612
15 2384
16 2267
17 8726
18 8464
19 32278
20 31822
21 120419
22 120338
23 452420
24 457320
25 1709845
26 1745438
27 6494848
28 6686929
29 24779026
30 25703792
31 94899470
32 99096382
33 364680344

List of values

[1, 0, 2, 1, 5, 4, 16, 13, 54, 46, 186, 167, 660, 612, 2384, 2267, 8726, 8464, 32278, 31822, 120419, 120338, 452420, 457320, 1709845, 1745438, 6494848, 6686929, 24779026, 25703792, 94899470, 99096382, 364680344]

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

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