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.

A271212 a(n) = (2n-1)*a(n-1) + 2*(n-2)*a(n-2).

Table of values

n a(n)
0 1
1 2
2 6
3 34
4 262
5 2562
6 30278
7 419234
8 6651846
9 118950658
10 2366492038
11 51837444642
12 1239591067526
13 32130200470274
14 897265598318022
15 26856087563449762
16 857662151219847238
17 29108533617158451714
18 1046243865439580921606
19 39700713164247881457698
20 1585992592561492290028038

List of values

[1, 2, 6, 34, 262, 2562, 30278, 419234, 6651846, 118950658, 2366492038, 51837444642, 1239591067526, 32130200470274, 897265598318022, 26856087563449762, 857662151219847238, 29108533617158451714, 1046243865439580921606, 39700713164247881457698, 1585992592561492290028038]