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.

A256817 Number of length n+2 0..1 arrays with at most two downsteps in every n consecutive neighbor pairs.

Table of values

n a(n)
1 8
2 16
3 32
4 64
5 124
6 229
7 402
8 673
9 1080
10 1670
11 2500
12 3638
13 5164
14 7171
15 9766
16 13071
17 17224
18 22380
19 28712
20 36412
21 45692
22 56785
23 69946
24 85453
25 103608
26 124738
27 149196
28 177362
29 209644
30 246479
31 288334
32 335707
33 389128
34 449160
35 516400
36 591480
37 675068

List of values

[8, 16, 32, 64, 124, 229, 402, 673, 1080, 1670, 2500, 3638, 5164, 7171, 9766, 13071, 17224, 22380, 28712, 36412, 45692, 56785, 69946, 85453, 103608, 124738, 149196, 177362, 209644, 246479, 288334, 335707, 389128, 449160, 516400, 591480, 675068]