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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.

A221315 Number of nonnegative integer arrays of length n summing to n without equal adjacent values modulo 2.

Table of values

n a(n)
1 1
2 0
3 3
4 8
5 5
6 0
7 28
8 72
9 45
10 0
11 286
12 728
13 455
14 0
15 3060
16 7752
17 4845
18 0
19 33649
20 85008
21 53130
22 0
23 376740
24 950040
25 593775
26 0
27 4272048
28 10759232
29 6724520
30 0
31 48903492
32 123047496
33 76904685
34 0
35 563921995
36 1417861016
37 886163135
38 0
39 6540715896
40 16435645072

List of values

[1, 0, 3, 8, 5, 0, 28, 72, 45, 0, 286, 728, 455, 0, 3060, 7752, 4845, 0, 33649, 85008, 53130, 0, 376740, 950040, 593775, 0, 4272048, 10759232, 6724520, 0, 48903492, 123047496, 76904685, 0, 563921995, 1417861016, 886163135, 0, 6540715896, 16435645072]

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

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