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.

A258948 a(1)=1, a(2)=2; for n>2, a(n) = (1/2)*a(n-1)*a(n-2) + a(n-1) + a(n-2).

Table of values

n a(n)
1 1
2 2
3 4
4 10
5 34
6 214
7 3886
8 419902
9 816293374
10 171382426877950
11 69949169911638289022974
12 5994029248777394614754727872037912574
13 209638685189029793998133268981457005889853767752082771673086

List of values

[1, 2, 4, 10, 34, 214, 3886, 419902, 816293374, 171382426877950, 69949169911638289022974, 5994029248777394614754727872037912574, 209638685189029793998133268981457005889853767752082771673086]