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.

A100223 G.f. A(x) satisfies: 2^n - 1 = Sum_{k=0..n} [x^k]A(x)^n and also satisfies: (2+z)^n - (1+z)^n + z^n = Sum_{k=0..n} [x^k](A(x)+z*x)^n for all z, where [x^k]A(x)^n denotes the coefficient of x^k in A(x)^n.

Table of values

n a(n)
0 1
1 0
2 1
3 1
4 0
5 -2
6 -3
7 1
8 11
9 15
10 -13
11 -77
12 -86
13 144
14 595
15 495
16 -1520
17 -4810
18 -2485
19 15675
20 39560
21 6290
22 -159105
23 -324805
24 87075
25 1592843
26 2616757
27 -2136539
28 -15726114
29 -20247800
30 32296693
31 152909577
32 145139491
33 -417959049
34 -1460704685
35 -885536173
36 4997618808
37 13658704994
38 3223741399

List of values

[1, 0, 1, 1, 0, -2, -3, 1, 11, 15, -13, -77, -86, 144, 595, 495, -1520, -4810, -2485, 15675, 39560, 6290, -159105, -324805, 87075, 1592843, 2616757, -2136539, -15726114, -20247800, 32296693, 152909577, 145139491, -417959049, -1460704685, -885536173, 4997618808, 13658704994, 3223741399]