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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.

A287253 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= three.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 15
5 51
6 191
7 780
8 3440
9 16249
10 81736
11 435796
12 2453100
13 14529728
14 90294625
15 587256087
16 3988153356
17 28223370977
18 207745253237
19 1587804229045
20 12581186077773
21 103197641796678
22 875085283793768
23 7661468372063681
24 69173450911547978
25 643354845906697516

List of values

[1, 1, 2, 5, 15, 51, 191, 780, 3440, 16249, 81736, 435796, 2453100, 14529728, 90294625, 587256087, 3988153356, 28223370977, 207745253237, 1587804229045, 12581186077773, 103197641796678, 875085283793768, 7661468372063681, 69173450911547978, 643354845906697516]

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

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