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.

A255662 Number of length n+2 0..3 arrays with at most two downsteps in every n consecutive neighbor pairs.

Table of values

n a(n)
1 64
2 256
3 1016
4 3692
5 11752
6 33042
7 83752
8 195020
9 423460
10 867347
11 1690744
12 3158528
13 5686080
14 9908365
15 16774260
16 27673310
17 44603624
18 70391386
19 108974472
20 165764956
21 248107880
22 365856580
23 532088128
24 763986096
25 1083921900
26 1520770469

List of values

[64, 256, 1016, 3692, 11752, 33042, 83752, 195020, 423460, 867347, 1690744, 3158528, 5686080, 9908365, 16774260, 27673310, 44603624, 70391386, 108974472, 165764956, 248107880, 365856580, 532088128, 763986096, 1083921900, 1520770469]