cp's OEIS Frontend

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.

A362581 Number of alternating permutations on [2n+1] with 1 in position n+1.

Table of values

n a(n)
0 1
1 2
2 6
3 80
4 1750
5 64512
6 3438204
7 253913088
8 24687555750
9 3062092267520
10 471565937953396
11 88298062293762048
12 19753693667117055100
13 5203824518733863321600
14 1594426273578194363292600
15 562191171748426920367226880
16 226024705816530632892282399750

List of values

[1, 2, 6, 80, 1750, 64512, 3438204, 253913088, 24687555750, 3062092267520, 471565937953396, 88298062293762048, 19753693667117055100, 5203824518733863321600, 1594426273578194363292600, 562191171748426920367226880, 226024705816530632892282399750]

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

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