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.

A144721 a(0) = 2, a(1) = 5, a(n) = 4 * a(n-1) - a(n-2).

Table of values

n a(n)
0 2
1 5
2 18
3 67
4 250
5 933
6 3482
7 12995
8 48498
9 180997
10 675490
11 2520963
12 9408362
13 35112485
14 131041578
15 489053827
16 1825173730
17 6811641093
18 25421390642
19 94873921475
20 354074295258
21 1321423259557
22 4931618742970
23 18405051712323
24 68688588106322
25 256349300712965

List of values

[2, 5, 18, 67, 250, 933, 3482, 12995, 48498, 180997, 675490, 2520963, 9408362, 35112485, 131041578, 489053827, 1825173730, 6811641093, 25421390642, 94873921475, 354074295258, 1321423259557, 4931618742970, 18405051712323, 68688588106322, 256349300712965]