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.

A076026 Expansion of g.f.: (1-4*x*C)/(1-5*x*C) where C = (1/2-1/2*(1-4*x)^(1/2))/x = g.f. for Catalan numbers A000108.

Table of values

n a(n)
0 1
1 1
2 6
3 37
4 230
5 1434
6 8952
7 55917
8 349374
9 2183230
10 13643972
11 85270626
12 532926716
13 3330739972
14 20816939100
15 130105200765
16 813155081070
17 5082210417270
18 31763782696740
19 198523522444950
20 1240771573465140
21 7754820693127020
22 48467623215477120
23 302922622226091090

List of values

[1, 1, 6, 37, 230, 1434, 8952, 55917, 349374, 2183230, 13643972, 85270626, 532926716, 3330739972, 20816939100, 130105200765, 813155081070, 5082210417270, 31763782696740, 198523522444950, 1240771573465140, 7754820693127020, 48467623215477120, 302922622226091090]