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.

A335441 a(n) = 1 + Sum_{k=1..n-1} binomial(n-2,k-1) * a(k) * a(n-k-1).

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 11
5 40
6 176
7 907
8 5360
9 35668
10 263789
11 2146390
12 19054040
13 183248581
14 1897952690
15 21061861828
16 249309196559
17 3135518918800
18 41754612283244
19 586922460056851
20 8684272948653068
21 134919751191875572
22 2195942678525060093
23 37365571515146318650

List of values

[1, 1, 2, 4, 11, 40, 176, 907, 5360, 35668, 263789, 2146390, 19054040, 183248581, 1897952690, 21061861828, 249309196559, 3135518918800, 41754612283244, 586922460056851, 8684272948653068, 134919751191875572, 2195942678525060093, 37365571515146318650]