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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.

A287281 Number of set partitions of [n] such that for each block all absolute differences between consecutive elements are <= nine.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 15
5 52
6 203
7 877
8 4140
9 21147
10 115975
11 657423
12 3827518
13 22762925
14 137649001
15 843059144
16 5212898020
17 32457312604
18 203096802134
19 1275403897840
20 8030979290267
21 50672180941765
22 320201670174878
23 2025623521511803
24 12824705758528817
25 81244888488645467

List of values

[1, 1, 2, 5, 15, 52, 203, 877, 4140, 21147, 115975, 657423, 3827518, 22762925, 137649001, 843059144, 5212898020, 32457312604, 203096802134, 1275403897840, 8030979290267, 50672180941765, 320201670174878, 2025623521511803, 12824705758528817, 81244888488645467]

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

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