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.

A207569 G.f.: Sum_{n>=0} Product_{k=1..n} ((1+x)^(2*k-1) - 1).

Table of values

n a(n)
0 1
1 1
2 3
3 18
4 151
5 1640
6 21825
7 343763
8 6253234
9 128993019
10 2975165831
11 75866604098
12 2119310099700
13 64361149952242
14 2111222815441491
15 74391641880144734
16 2802300974537717340
17 112379709083552152423
18 4780136025081921948194
19 214954914688567198802759

List of values

[1, 1, 3, 18, 151, 1640, 21825, 343763, 6253234, 128993019, 2975165831, 75866604098, 2119310099700, 64361149952242, 2111222815441491, 74391641880144734, 2802300974537717340, 112379709083552152423, 4780136025081921948194, 214954914688567198802759]