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.

A056879 Number of n-celled axially symmetric polyominoes without holes.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 2
6 6
7 9
8 23
9 37
10 87
11 138
12 313
13 510
14 1130
15 1859
16 4070
17 6786
18 14750
19 24811
20 53715
21 91096
22 196769
23 335815
24 724470
25 1243175
26 2680212
27 4619999
28 9957652
29 17231447
30 37137177
31 64480255
32 138978282
33 242011375
34 521706359
35 910817416
36 1963885190
37 3436463468
38 7411495499
39 12995261895
40 28034824487

List of values

[0, 0, 0, 1, 2, 6, 9, 23, 37, 87, 138, 313, 510, 1130, 1859, 4070, 6786, 14750, 24811, 53715, 91096, 196769, 335815, 724470, 1243175, 2680212, 4619999, 9957652, 17231447, 37137177, 64480255, 138978282, 242011375, 521706359, 910817416, 1963885190, 3436463468, 7411495499, 12995261895, 28034824487]

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

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