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.

A329666 Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UU and HH.

Table of values

n a(n)
0 1
1 1
2 1
3 3
4 4
5 7
6 15
7 26
8 50
9 102
10 196
11 392
12 800
13 1609
14 3290
15 6786
16 13973
17 28998
18 60469
19 126295
20 264945
21 557594
22 1176004
23 2487485
24 5274110
25 11204631
26 23854581
27 50881939
28 108715072
29 232671125
30 498724913
31 1070525053
32 2301048452
33 4952319218
34 10671175097
35 23020363339

List of values

[1, 1, 1, 3, 4, 7, 15, 26, 50, 102, 196, 392, 800, 1609, 3290, 6786, 13973, 28998, 60469, 126295, 264945, 557594, 1176004, 2487485, 5274110, 11204631, 23854581, 50881939, 108715072, 232671125, 498724913, 1070525053, 2301048452, 4952319218, 10671175097, 23020363339]