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.

A308616 Number of well-formed formulas of length n in a formal propositional language with one unitary operator, one binary operator, and one propositional variable.

Table of values

n a(n)
1 1
2 0
3 0
4 1
5 1
6 0
7 1
8 3
9 2
10 1
11 6
12 10
13 6
14 10
15 30
16 36
17 29
18 70
19 141
20 147
21 182
22 421
23 658
24 714
25 1183
26 2346
27 3192
28 4027
29 7404
30 12672
31 16633
32 24508
33 44462
34 68641
35 93588
36 151866
37 260118
38 381888
39 557128
40 934220
41 1509807
42 2205216
43 3414269
44 5681573
45 8828612
46 13179557
47 21120648
48 34335784
49 52494403
50 80688120

List of values

[1, 0, 0, 1, 1, 0, 1, 3, 2, 1, 6, 10, 6, 10, 30, 36, 29, 70, 141, 147, 182, 421, 658, 714, 1183, 2346, 3192, 4027, 7404, 12672, 16633, 24508, 44462, 68641, 93588, 151866, 260118, 381888, 557128, 934220, 1509807, 2205216, 3414269, 5681573, 8828612, 13179557, 21120648, 34335784, 52494403, 80688120]