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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.

A272493 Number of ordered set partitions of [n] with nondecreasing block sizes and maximal block size equal to three.

Table of values

n a(n)
3 1
4 4
5 30
6 200
7 1610
8 13440
9 130200
10 1327200
11 15107400
12 183321600
13 2422820400
14 34104470400
15 515897382000
16 8276556288000
17 141290381232000
18 2546760408192000
19 48489153817104000
20 970454450085120000
21 20400874234060320000
22 448974320483969280000

List of values

[1, 4, 30, 200, 1610, 13440, 130200, 1327200, 15107400, 183321600, 2422820400, 34104470400, 515897382000, 8276556288000, 141290381232000, 2546760408192000, 48489153817104000, 970454450085120000, 20400874234060320000, 448974320483969280000]

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

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