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.

A192347 Coefficient of x in the reduction (by x^2->x+1) of polynomial p(n,x) identified in Comments.

Table of values

n a(n)
1 0
2 1
3 2
4 11
5 32
6 125
7 418
8 1511
9 5248
10 18601
11 65250
12 230099
13 809248
14 2849989
15 10030018
16 35311375
17 124293632
18 437545489
19 1540200002
20 5421774299
21 19085364000
22 67183428301
23 236495292002
24 832498651511
25 2930516834432
26 10315851565625

List of values

[0, 1, 2, 11, 32, 125, 418, 1511, 5248, 18601, 65250, 230099, 809248, 2849989, 10030018, 35311375, 124293632, 437545489, 1540200002, 5421774299, 19085364000, 67183428301, 236495292002, 832498651511, 2930516834432, 10315851565625]