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.

A255109 Number of length n+2 0..2 arrays with at most one downstep in every n consecutive neighbor pairs.

Table of values

n a(n)
1 27
2 75
3 168
4 331
5 597
6 1008
7 1616
8 2484
9 3687
10 5313
11 7464
12 10257
13 13825
14 18318
15 23904
16 30770
17 39123
18 49191
19 61224
20 75495
21 92301
22 111964
23 134832
24 161280
25 191711
26 226557
27 266280
28 311373
29 362361
30 419802
31 484288
32 556446
33 636939
34 726467
35 825768
36 935619

List of values

[27, 75, 168, 331, 597, 1008, 1616, 2484, 3687, 5313, 7464, 10257, 13825, 18318, 23904, 30770, 39123, 49191, 61224, 75495, 92301, 111964, 134832, 161280, 191711, 226557, 266280, 311373, 362361, 419802, 484288, 556446, 636939, 726467, 825768, 935619]