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.

A192874 Constant term in the reduction by (x^2 -> x + 1) of the polynomial p(n,x) given in Comments.

Table of values

n a(n)
0 1
1 0
2 4
3 6
4 26
5 72
6 246
7 774
8 2532
9 8150
10 26434
11 85448
12 276654
13 895054
14 2896788
15 9373678
16 30334682
17 98163784
18 317666758
19 1027987894
20 3326644036
21 10765237670
22 34837054674
23 112735054856
24 364818336766
25 1180576879422

List of values

[1, 0, 4, 6, 26, 72, 246, 774, 2532, 8150, 26434, 85448, 276654, 895054, 2896788, 9373678, 30334682, 98163784, 317666758, 1027987894, 3326644036, 10765237670, 34837054674, 112735054856, 364818336766, 1180576879422]