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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.

A347258 Number of fixed hexagonal polyominoes with n cells that have a horizontal axis of symmetry that is a diagonal of at least one of the n cells.

Table of values

n a(n)
1 1
2 0
3 3
4 1
5 10
6 5
7 40
8 23
9 169
10 107
11 741
12 499
13 3334
14 2349
15 15278
16 11141
17 71012
18 53198
19 333756
20 255553
21 1582885
22 1234059
23 7563365
24 5986757
25 36367445
26 29161696
27 175810059
28 142561190
29 853868747
30 699179932
31 4163891024

List of values

[1, 0, 3, 1, 10, 5, 40, 23, 169, 107, 741, 499, 3334, 2349, 15278, 11141, 71012, 53198, 333756, 255553, 1582885, 1234059, 7563365, 5986757, 36367445, 29161696, 175810059, 142561190, 853868747, 699179932, 4163891024]

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

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