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.

A358118 a(n) = Sum_{j=0..n} (-1)^j*binomial(2*n - j, j)*c(n - j + 1)^2, where c(n) is the n-th Catalan number.

Table of values

n a(n)
0 1
1 3
2 14
3 94
4 728
5 6220
6 56960
7 549412
8 5517746
9 57235402
10 609632284
11 6638455152
12 73653980850
13 830429715762
14 9494320306104
15 109882451968812
16 1285515149382226
17 15184272319785322
18 180901975355930990
19 2171974459996885630
20 26260944994924397048
21 319547523490735463404

List of values

[1, 3, 14, 94, 728, 6220, 56960, 549412, 5517746, 57235402, 609632284, 6638455152, 73653980850, 830429715762, 9494320306104, 109882451968812, 1285515149382226, 15184272319785322, 180901975355930990, 2171974459996885630, 26260944994924397048, 319547523490735463404]