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.

A256821 Number of length n+6 0..1 arrays with at most two downsteps in every n consecutive neighbor pairs.

Table of values

n a(n)
1 128
2 256
3 512
4 1024
5 1888
6 3204
7 5088
8 7677
9 11120
10 15579
11 21230
12 28264
13 36888
14 47326
15 59820
16 74631
17 92040
18 112349
19 135882
20 162986
21 194032
22 229416
23 269560
24 314913
25 365952
26 423183
27 487142
28 558396
29 637544
30 725218
31 822084
32 928843
33 1046232

List of values

[128, 256, 512, 1024, 1888, 3204, 5088, 7677, 11120, 15579, 21230, 28264, 36888, 47326, 59820, 74631, 92040, 112349, 135882, 162986, 194032, 229416, 269560, 314913, 365952, 423183, 487142, 558396, 637544, 725218, 822084, 928843, 1046232]

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

Content is available under The OEIS End-User License Agreement.