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.

A203577 Exponential (or binomial) half-convolution of the sequence A000108 (Catalan) with itself.

Table of values

n a(n)
0 1
1 1
2 4
3 11
4 58
5 212
6 1304
7 5567
8 37734
9 178148
10 1284124
11 6501420
12 48758648
13 259775440
14 2000594288
15 11080668871
16 86930955662
17 496461841956
18 3947716126292
19 23113333523180
20 185660199980696
21 1109722749130576
22 8983793097101144
23 54645629076275356
24 445109373450545608
25 2748480598104423952

List of values

[1, 1, 4, 11, 58, 212, 1304, 5567, 37734, 178148, 1284124, 6501420, 48758648, 259775440, 2000594288, 11080668871, 86930955662, 496461841956, 3947716126292, 23113333523180, 185660199980696, 1109722749130576, 8983793097101144, 54645629076275356, 445109373450545608, 2748480598104423952]

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

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