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.

A118347 Semi-diagonal (one row below central terms) of pendular triangle A118345 and equal to the self-convolution of the central terms (A118346).

Table of values

n a(n)
0 1
1 2
2 11
3 70
4 487
5 3592
6 27600
7 218566
8 1771367
9 14621410
10 122495659
11 1038934480
12 8903129300
13 76970244560
14 670507216168
15 5879770542870
16 51861650744071
17 459804626981158
18 4095433894576785
19 36628711884398086
20 328824295880947471

List of values

[1, 2, 11, 70, 487, 3592, 27600, 218566, 1771367, 14621410, 122495659, 1038934480, 8903129300, 76970244560, 670507216168, 5879770542870, 51861650744071, 459804626981158, 4095433894576785, 36628711884398086, 328824295880947471]

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

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