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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.

A238439 Number of pairs (C,D) where C is a composition of u, D is a composition into distinct parts of v, and u + v = n.

Table of values

n a(n)
0 1
1 2
2 4
3 10
4 20
5 42
6 90
7 182
8 370
9 748
10 1526
11 3060
12 6156
13 12344
14 24748
15 49654
16 99392
17 198966
18 398166
19 796658
20 1593694
21 3188584
22 6377714
23 12756888
24 25515312
25 51033092
26 102068728
27 204141754
28 408292220
29 816590586
30 1633192578
31 3266399030
32 6532817194
33 13065657556

List of values

[1, 2, 4, 10, 20, 42, 90, 182, 370, 748, 1526, 3060, 6156, 12344, 24748, 49654, 99392, 198966, 398166, 796658, 1593694, 3188584, 6377714, 12756888, 25515312, 51033092, 102068728, 204141754, 408292220, 816590586, 1633192578, 3266399030, 6532817194, 13065657556]

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

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