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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.

A350461 Number of ways to choose a subset of size n from [2n] and arrange its elements into a set of lists.

Table of values

n a(n)
0 1
1 2
2 18
3 260
4 5110
5 126252
6 3743124
7 129156456
8 5075323110
9 223484406860
10 10889720208796
11 581327564001912
12 33721264023340348
13 2111076358455927800
14 141812884019465389800
15 10171645727323281955920
16 775654703427461395949190
17 62649431136582816113115660

List of values

[1, 2, 18, 260, 5110, 126252, 3743124, 129156456, 5075323110, 223484406860, 10889720208796, 581327564001912, 33721264023340348, 2111076358455927800, 141812884019465389800, 10171645727323281955920, 775654703427461395949190, 62649431136582816113115660]

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

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