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.

A100231 G.f. A(x) satisfies: 5^n - 1 = Sum_{k=0..n} [x^k]A(x)^n and also satisfies: (5+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 3
2 4
3 -8
4 0
5 64
6 -192
7 -128
8 2816
9 -7680
10 -13312
11 157696
12 -352256
13 -1179648
14 9748480
15 -16220160
16 -99614720
17 630456320
18 -651427840
19 -8218214400
20 41481666560
21 -13191086080
22 -667334737920
23 2724661821440
24 1460876083200
25 -53446942130176
26 175607589634048
27 286761410363392

List of values

[1, 3, 4, -8, 0, 64, -192, -128, 2816, -7680, -13312, 157696, -352256, -1179648, 9748480, -16220160, -99614720, 630456320, -651427840, -8218214400, 41481666560, -13191086080, -667334737920, 2724661821440, 1460876083200, -53446942130176, 175607589634048, 286761410363392]