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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.

A350243 Number of achiral hexagonal polyominoes with 3n cells and threefold rotational symmetry centered at a vertex.

Table of values

n a(n)
1 1
2 1
3 2
4 5
5 9
6 19
7 39
8 82
9 171
10 368
11 773
12 1678
13 3559
14 7776
15 16601
16 36470
17 78295
18 172720
19 372440
20 824512
21 1784463
22 3961869
23 8601227
24 19143685
25 41671452
26 92944943
27 202787164
28 453138925
29 990656774
30 2217280465
31 4856097782
32 10884558781
33 23876327783
34 53585821550
35 117713147451

List of values

[1, 1, 2, 5, 9, 19, 39, 82, 171, 368, 773, 1678, 3559, 7776, 16601, 36470, 78295, 172720, 372440, 824512, 1784463, 3961869, 8601227, 19143685, 41671452, 92944943, 202787164, 453138925, 990656774, 2217280465, 4856097782, 10884558781, 23876327783, 53585821550, 117713147451]

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

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