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.

A068718 Boustrophedon transform of A068717 with A068717(1) = -1 instead of 0.

Table of values

n a(n)
0 1
1 2
2 2
3 2
4 8
5 25
6 90
7 404
8 2055
9 11792
10 75053
11 525622
12 4015361
13 33231679
14 296182315
15 2828335731
16 28809181418
17 311788442591
18 3572832236720
19 43216177809190
20 550245463265240
21 7356239983352887
22 103028812072639378

List of values

[1, 2, 2, 2, 8, 25, 90, 404, 2055, 11792, 75053, 525622, 4015361, 33231679, 296182315, 2828335731, 28809181418, 311788442591, 3572832236720, 43216177809190, 550245463265240, 7356239983352887, 103028812072639378]

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

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