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.

A000819 E.g.f.: cos(x)^2 / cos(2x) = Sum_{n >= 0} a(n) * x^(2n) / (2n)!.

Table of values

n a(n)
0 1
1 2
2 40
3 1952
4 177280
5 25866752
6 5535262720
7 1633165156352
8 635421069967360
9 315212388819402752
10 194181169538675507200
11 145435130631317935357952
12 130145345400688287667978240
13 137139396592145493713802493952

List of values

[1, 2, 40, 1952, 177280, 25866752, 5535262720, 1633165156352, 635421069967360, 315212388819402752, 194181169538675507200, 145435130631317935357952, 130145345400688287667978240, 137139396592145493713802493952]