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.

A177286 Number of permutations of 2 copies of 1..n with all adjacent differences <= 5 in absolute value.

Table of values

n a(n)
0 1
1 1
2 6
3 90
4 2520
5 113400
6 7484400
7 349272000
8 12629539440
9 394462558980
10 11673071453460
11 348672825749478
12 10924880404749722
13 348078897908489130
14 11059657083803795688
15 346844915294462956440
16 10705742604901078977600

List of values

[1, 1, 6, 90, 2520, 113400, 7484400, 349272000, 12629539440, 394462558980, 11673071453460, 348672825749478, 10924880404749722, 348078897908489130, 11059657083803795688, 346844915294462956440, 10705742604901078977600]

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

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