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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.

A238020 Number of nonconsecutive chess tableaux with n cells.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 2
6 4
7 5
8 10
9 15
10 33
11 52
12 126
13 213
14 537
15 991
16 2563
17 5118
18 13670
19 29171
20 81069
21 180813
22 525755
23 1216996
24 3693934
25 8843831
26 27797975
27 69106326
28 223116931
29 577433770
30 1903516721
31 5136516772
32 17257698892
33 48388514996
34 166022450140
35 481137194184

List of values

[1, 1, 1, 1, 2, 2, 4, 5, 10, 15, 33, 52, 126, 213, 537, 991, 2563, 5118, 13670, 29171, 81069, 180813, 525755, 1216996, 3693934, 8843831, 27797975, 69106326, 223116931, 577433770, 1903516721, 5136516772, 17257698892, 48388514996, 166022450140, 481137194184]

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

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