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.

A079489 a(n) = (2*4^n*binomial(2*n, n) - binomial(4*n + 1, 2*n)) / (n + 1).

Table of values

n a(n)
0 1
1 3
2 22
3 211
4 2306
5 27230
6 338444
7 4362627
8 57788170
9 781825066
10 10757497972
11 150073096238
12 2117778107732
13 30176799215196
14 433586825237912
15 6274885068167651
16 91383942213277530
17 1338275570267001458
18 19695358741104824036
19 291137841642777382330
20 4320734864185863437820

List of values

[1, 3, 22, 211, 2306, 27230, 338444, 4362627, 57788170, 781825066, 10757497972, 150073096238, 2117778107732, 30176799215196, 433586825237912, 6274885068167651, 91383942213277530, 1338275570267001458, 19695358741104824036, 291137841642777382330, 4320734864185863437820]