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.

A172025 Expansion of (2/(3*sqrt(1-4*z)-1+4*z))*((1-sqrt(1-4*z))/(2*z))^k with k=3.

Table of values

n a(n)
0 1
1 4
2 16
3 62
4 239
5 920
6 3544
7 13672
8 52834
9 204528
10 793092
11 3080226
12 11980667
13 46662704
14 181971248
15 710454896
16 2776717742
17 10863073784
18 42537035408
19 166704021596
20 653827252022
21 2566222449104
22 10079023179536
23 39611016586832

List of values

[1, 4, 16, 62, 239, 920, 3544, 13672, 52834, 204528, 793092, 3080226, 11980667, 46662704, 181971248, 710454896, 2776717742, 10863073784, 42537035408, 166704021596, 653827252022, 2566222449104, 10079023179536, 39611016586832]