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.

A136303 Expansion of g.f. (1 +x^2)/((1-x)^2*(1 -3*x +2*x^2 -x^3)).

Table of values

n a(n)
0 1
1 5
2 17
3 48
4 123
5 300
6 714
7 1679
8 3925
9 9149
10 21296
11 49537
12 115192
13 267824
14 622653
15 1447533
16 3365149
17 7823068
18 18186475
19 42278476
20 98285586
21 228486323
22 531166317
23 1234811937
24 2870589548
25 6673311137
26 15513566304
27 36064666240
28 83840177305

List of values

[1, 5, 17, 48, 123, 300, 714, 1679, 3925, 9149, 21296, 49537, 115192, 267824, 622653, 1447533, 3365149, 7823068, 18186475, 42278476, 98285586, 228486323, 531166317, 1234811937, 2870589548, 6673311137, 15513566304, 36064666240, 83840177305]