cp's OEIS Frontend

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.

A057423 Diagonally symmetric n-celled polyominoes with 1 hole.

Table of values

n a(n)
7 1
8 0
9 5
10 4
11 20
12 18
13 79
14 84
15 304
16 332
17 1149
18 1309
19 4312
20 5005
21 16136
22 19049
23 60347
24 71979
25 225867
26 271781
27 846667
28 1025315
29 3179798
30 3871607
31 11966976
32 14633947
33 45131841
34 55395495
35 170560833
36 210008554
37 645861961
38 797419730
39 2450316125
40 3032540599

List of values

[1, 0, 5, 4, 20, 18, 79, 84, 304, 332, 1149, 1309, 4312, 5005, 16136, 19049, 60347, 71979, 225867, 271781, 846667, 1025315, 3179798, 3871607, 11966976, 14633947, 45131841, 55395495, 170560833, 210008554, 645861961, 797419730, 2450316125, 3032540599]