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.

A006215 Number of down-up permutations of n+6 starting with n+1.

Table of values

n a(n)
0 0
1 16
2 122
3 800
4 5296
5 36976
6 275792
7 2204480
8 18870016
9 172585936
10 1681843712
11 17411416160
12 190939611136
13 2211961358896
14 26999750469632
15 346419349043840
16 4661658528710656
17 65657186909139856
18 966054350401175552
19 14822897275566895520

List of values

[0, 16, 122, 800, 5296, 36976, 275792, 2204480, 18870016, 172585936, 1681843712, 17411416160, 190939611136, 2211961358896, 26999750469632, 346419349043840, 4661658528710656, 65657186909139856, 966054350401175552, 14822897275566895520]

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

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