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.

A110128 Number of permutations p of 1,2,...,n satisfying |p(i+2)-p(i)| not equal to 2 for all 0

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 16
5 44
6 200
7 1288
8 9512
9 78652
10 744360
11 7867148
12 91310696
13 1154292796
14 15784573160
15 232050062524
16 3648471927912
17 61080818510972
18 1084657970877416
19 20361216987032284
20 402839381030339816
21 8377409956454452732

List of values

[1, 1, 2, 4, 16, 44, 200, 1288, 9512, 78652, 744360, 7867148, 91310696, 1154292796, 15784573160, 232050062524, 3648471927912, 61080818510972, 1084657970877416, 20361216987032284, 402839381030339816, 8377409956454452732]

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

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