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.

A276508 a(n) = (2*5^n + 3*(-1)^(floor((n-1)/3)) + (-1)^n)/6.

Table of values

n a(n)
0 0
1 2
2 9
3 42
4 208
5 1041
6 5208
7 26042
8 130209
9 651042
10 3255208
11 16276041
12 81380208
13 406901042
14 2034505209
15 10172526042
16 50862630208
17 254313151041
18 1271565755208
19 6357828776042
20 31789143880209
21 158945719401042
22 794728597005208
23 3973642985026041
24 19868214925130208
25 99341074625651042

List of values

[0, 2, 9, 42, 208, 1041, 5208, 26042, 130209, 651042, 3255208, 16276041, 81380208, 406901042, 2034505209, 10172526042, 50862630208, 254313151041, 1271565755208, 6357828776042, 31789143880209, 158945719401042, 794728597005208, 3973642985026041, 19868214925130208, 99341074625651042]