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.

A133106 Number of Ferrers diagrams with a single Ferrers puncture with the same orientation inscribed strictly inside with half-perimeter = n.

Table of values

n a(n)
8 1
9 8
10 41
11 168
12 602
13 1968
14 6021
15 17512
16 48950
17 132496
18 349258
19 900368
20 2277556
21 5667936
22 13906221
23 33695208
24 80746846
25 191601872
26 450642654
27 1051472048
28 2435679852
29 5605044640
30 12820922530
31 29164511376
32 66004709148
33 148678206880

List of values

[1, 8, 41, 168, 602, 1968, 6021, 17512, 48950, 132496, 349258, 900368, 2277556, 5667936, 13906221, 33695208, 80746846, 191601872, 450642654, 1051472048, 2435679852, 5605044640, 12820922530, 29164511376, 66004709148, 148678206880]

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

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