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.

A242840 Number of compositions of n with difference -1 between the number of odd parts and the number of even parts, both counted without multiplicity.

Table of values

n a(n)
2 1
3 0
4 2
5 0
6 2
7 6
8 15
9 44
10 74
11 202
12 351
13 766
14 1301
15 2626
16 4677
17 8993
18 16466
19 31671
20 60266
21 116751
22 229180
23 452667
24 905627
25 1815394
26 3673666
27 7429123
28 15109955
29 30696510
30 62512866
31 127140993
32 258745131
33 525845884
34 1068309682
35 2167462318
36 4393853912
37 8896007640

List of values

[1, 0, 2, 0, 2, 6, 15, 44, 74, 202, 351, 766, 1301, 2626, 4677, 8993, 16466, 31671, 60266, 116751, 229180, 452667, 905627, 1815394, 3673666, 7429123, 15109955, 30696510, 62512866, 127140993, 258745131, 525845884, 1068309682, 2167462318, 4393853912, 8896007640]

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

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