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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.

A167484 For n people on one side of a river, the number of ways they can all travel to the opposite side following the pattern of 2 sent, 1 returns, 2 sent, 1 returns, ..., 2 sent.

Table of values

n a(n)
1 1
2 1
3 6
4 108
5 4320
6 324000
7 40824000
8 8001504000
9 2304433152000
10 933295426560000
11 513312484608000000
12 372664863825408000000
13 348814312540581888000000
14 412647331735508373504000000
15 606591577651197309050880000000
16 1091864839772155156291584000000000
17 2375897891344209620090486784000000000

List of values

[1, 1, 6, 108, 4320, 324000, 40824000, 8001504000, 2304433152000, 933295426560000, 513312484608000000, 372664863825408000000, 348814312540581888000000, 412647331735508373504000000, 606591577651197309050880000000, 1091864839772155156291584000000000, 2375897891344209620090486784000000000]

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

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