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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.

A242507 Number of compositions of n, where the difference between the number of odd parts and the number of even parts is 9.

Table of values

n a(n)
9 1
10 0
11 9
12 11
13 45
14 121
15 243
16 726
17 1509
18 3601
19 8385
20 17836
21 40873
22 87633
23 188855
24 409116
25 859674
26 1827160
27 3832786
28 7981398
29 16644666
30 34362355
31 70866846
32 145637147
33 297814569
34 608309130
35 1237764177
36 2512564769
37 5090761029
38 10286177231
39 20750532587
40 41778968976

List of values

[1, 0, 9, 11, 45, 121, 243, 726, 1509, 3601, 8385, 17836, 40873, 87633, 188855, 409116, 859674, 1827160, 3832786, 7981398, 16644666, 34362355, 70866846, 145637147, 297814569, 608309130, 1237764177, 2512564769, 5090761029, 10286177231, 20750532587, 41778968976]

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

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