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.

A131524 Number of possible palindromic rows (or columns) in an n X n crossword puzzle.

Table of values

n a(n)
1 0
2 0
3 1
4 1
5 2
6 2
7 4
8 4
9 7
10 7
11 12
12 12
13 20
14 20
15 33
16 33
17 54
18 54
19 88
20 88
21 143
22 143
23 232
24 232
25 376
26 376
27 609
28 609
29 986
30 986
31 1596
32 1596
33 2583
34 2583
35 4180
36 4180
37 6764
38 6764
39 10945
40 10945
41 17710
42 17710
43 28656
44 28656
45 46367
46 46367
47 75024
48 75024
49 121392
50 121392

List of values

[0, 0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 20, 20, 33, 33, 54, 54, 88, 88, 143, 143, 232, 232, 376, 376, 609, 609, 986, 986, 1596, 1596, 2583, 2583, 4180, 4180, 6764, 6764, 10945, 10945, 17710, 17710, 28656, 28656, 46367, 46367, 75024, 75024, 121392, 121392]