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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.

A272516 Number of set partitions of [n] into four blocks with distinct sizes.

Table of values

n a(n)
10 12600
11 27720
12 138600
13 643500
14 4408404
15 12687675
16 60780720
17 238299880
18 1295666424
19 4208874756
20 18840460800
21 72351683460
22 361100656224
23 1228553894491
24 5370616442928
25 20605640103400
26 97659853077800
27 342942099783075
28 1479570975628200
29 5678915129142255

List of values

[12600, 27720, 138600, 643500, 4408404, 12687675, 60780720, 238299880, 1295666424, 4208874756, 18840460800, 72351683460, 361100656224, 1228553894491, 5370616442928, 20605640103400, 97659853077800, 342942099783075, 1479570975628200, 5678915129142255]

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

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