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.

A363236 Number of permutations p of [n] such that each element in p has at least one neighbor with opposite parity.

Table of values

n a(n)
0 1
1 0
2 2
3 2
4 16
5 36
6 288
7 1152
8 10368
9 57600
10 604800
11 4320000
12 51840000
13 453600000
14 6147187200
15 63605606400
16 962415820800
17 11500218777600
18 192255565824000
19 2605984690176000
20 47721518530560000
21 723526168780800000
22 14407079038894080000
23 241602987041095680000

List of values

[1, 0, 2, 2, 16, 36, 288, 1152, 10368, 57600, 604800, 4320000, 51840000, 453600000, 6147187200, 63605606400, 962415820800, 11500218777600, 192255565824000, 2605984690176000, 47721518530560000, 723526168780800000, 14407079038894080000, 241602987041095680000]

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

Content is available under The OEIS End-User License Agreement.