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.

A133406 Half the number of ways of placing up to n pawns on a length n chessboard row so that the row balances at its middle.

Table of values

n a(n)
1 1
2 1
3 2
4 2
5 4
6 4
7 10
8 9
9 26
10 24
11 76
12 69
13 236
14 214
15 760
16 696
17 2522
18 2326
19 8556
20 7942
21 29504
22 27562
23 103130
24 96862
25 364548
26 344004
27 1300820
28 1232567
29 4679472
30 4449850
31 16952162
32 16171118
33 61790442
34 59107890
35 226451036
36 217157069
37 833918840

List of values

[1, 1, 2, 2, 4, 4, 10, 9, 26, 24, 76, 69, 236, 214, 760, 696, 2522, 2326, 8556, 7942, 29504, 27562, 103130, 96862, 364548, 344004, 1300820, 1232567, 4679472, 4449850, 16952162, 16171118, 61790442, 59107890, 226451036, 217157069, 833918840]