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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.

A005469 a(n) = 1 + a(floor(n/2))*a(ceiling(n/2)) for n > 1, a(1) = 2.

Table of values

n a(n)
1 2
2 5
3 11
4 26
5 56
6 122
7 287
8 677
9 1457
10 3137
11 6833
12 14885
13 35015
14 82370
15 194300
16 458330
17 986390
18 2122850
19 4570610
20 9840770
21 21435122
22 46689890
23 101709206
24 221563226
25 521198276
26 1226050226
27 2884185551
28 6784816901
29 16004491001
30 37752490001
31 89053519001

List of values

[2, 5, 11, 26, 56, 122, 287, 677, 1457, 3137, 6833, 14885, 35015, 82370, 194300, 458330, 986390, 2122850, 4570610, 9840770, 21435122, 46689890, 101709206, 221563226, 521198276, 1226050226, 2884185551, 6784816901, 16004491001, 37752490001, 89053519001]

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

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