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.

A189734 a(1)=2, a(2)=5, a(n)=2*a(n-1) + 5*a(n-2).

Table of values

n a(n)
1 2
2 5
3 20
4 65
5 230
6 785
7 2720
8 9365
9 32330
10 111485
11 384620
12 1326665
13 4576430
14 15786185
15 54454520
16 187839965
17 647952530
18 2235104885
19 7709972420
20 26595469265
21 91740800630
22 316458947585
23 1091621898320
24 3765538534565
25 12989186560730
26 44806065794285

List of values

[2, 5, 20, 65, 230, 785, 2720, 9365, 32330, 111485, 384620, 1326665, 4576430, 15786185, 54454520, 187839965, 647952530, 2235104885, 7709972420, 26595469265, 91740800630, 316458947585, 1091621898320, 3765538534565, 12989186560730, 44806065794285]