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.

A137229 Expansion of g.f. x/((1-x)*(1-3*x+2*x^2-x^3)).

Table of values

n a(n)
1 1
2 4
3 11
4 27
5 64
6 150
7 350
8 815
9 1896
10 4409
11 10251
12 23832
13 55404
14 128800
15 299425
16 696080
17 1618191
18 3761839
19 8745216
20 20330162
21 47261894
22 109870575
23 255418100
24 593775045
25 1380359511
26 3208946544
27 7459895656
28 17342153392
29 40315615409
30 93722435100
31 217878227875

List of values

[1, 4, 11, 27, 64, 150, 350, 815, 1896, 4409, 10251, 23832, 55404, 128800, 299425, 696080, 1618191, 3761839, 8745216, 20330162, 47261894, 109870575, 255418100, 593775045, 1380359511, 3208946544, 7459895656, 17342153392, 40315615409, 93722435100, 217878227875]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.