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.

A100132 a(n) = Sum_{k=0..floor(n/4)} C(n-2k,2k) * 2^(n-3k).

Table of values

n a(n)
0 1
1 2
2 4
3 8
4 18
5 44
6 112
7 288
8 740
9 1896
10 4848
11 12384
12 31624
13 80752
14 206208
15 526592
16 1344784
17 3434272
18 8770368
19 22397568
20 57198368
21 146071744
22 373034240
23 952645120
24 2432840256
25 6212924032
26 15866403584
27 40519208448
28 103476899968

List of values

[1, 2, 4, 8, 18, 44, 112, 288, 740, 1896, 4848, 12384, 31624, 80752, 206208, 526592, 1344784, 3434272, 8770368, 22397568, 57198368, 146071744, 373034240, 952645120, 2432840256, 6212924032, 15866403584, 40519208448, 103476899968]

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

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