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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.

A274874 Number of set partitions of [n] into exactly ten blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.

Table of values

n a(n)
10 1
11 5
12 95
13 475
14 5294
15 26470
16 227294
17 1136470
18 8351711
19 41758555
20 277114769
21 1385573845
22 8568214932
23 42841074660
24 251848578952
25 1259242894760
26 7132223195725
27 35661115978625
28 196428153720067
29 982140768600335
30 5296485323226634
31 26482426616133170

List of values

[1, 5, 95, 475, 5294, 26470, 227294, 1136470, 8351711, 41758555, 277114769, 1385573845, 8568214932, 42841074660, 251848578952, 1259242894760, 7132223195725, 35661115978625, 196428153720067, 982140768600335, 5296485323226634, 26482426616133170]

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

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