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.

A078483 G.f.: -2*x/(1 - 5*x - sqrt(1-4*x) + x*sqrt(1-4*x) + 2*x^2).

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 20
5 69
6 243
7 869
8 3145
9 11491
10 42312
11 156807
12 584288
13 2187298
14 8221257
15 31009841
16 117331070
17 445174418
18 1693270531
19 6454992143
20 24657428519
21 94363587324
22 361741068087
23 1388892123038
24 5340282880156
25 20560742443041
26 79259430563491
27 305889059254747

List of values

[1, 1, 2, 6, 20, 69, 243, 869, 3145, 11491, 42312, 156807, 584288, 2187298, 8221257, 31009841, 117331070, 445174418, 1693270531, 6454992143, 24657428519, 94363587324, 361741068087, 1388892123038, 5340282880156, 20560742443041, 79259430563491, 305889059254747]

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

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