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.

A193038 G.f. A(x) satisfies: x = Sum_{n>=1} x^n*A(-x)^sigma(n), where sigma(n) = sum of divisors of n (A000203).

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 23
5 101
6 475
7 2321
8 11629
9 59364
10 307648
11 1614724
12 8567810
13 45890927
14 247817187
15 1347819147
16 7376472346
17 40594360200
18 224500075274
19 1247028876157
20 6954322550810
21 38921347036195
22 218541728743211
23 1230754878156173
24 6950114772716368

List of values

[1, 1, 2, 6, 23, 101, 475, 2321, 11629, 59364, 307648, 1614724, 8567810, 45890927, 247817187, 1347819147, 7376472346, 40594360200, 224500075274, 1247028876157, 6954322550810, 38921347036195, 218541728743211, 1230754878156173, 6950114772716368]