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.

A143088 Triangle T(n,m) = (2^(m+1) - 1) * (2^(n-m+1) - 1), read by rows, 0 <= m <= n.

Table of values

n a(n)
0 1
1 3
2 3
3 7
4 9
5 7
6 15
7 21
8 21
9 15
10 31
11 45
12 49
13 45
14 31
15 63
16 93
17 105
18 105
19 93
20 63
21 127
22 189
23 217
24 225
25 217
26 189
27 127
28 255
29 381
30 441
31 465
32 465
33 441
34 381
35 255
36 511
37 765
38 889
39 945
40 961
41 945
42 889
43 765
44 511
45 1023
46 1533
47 1785
48 1905
49 1953
50 1953
51 1905
52 1785
53 1533
54 1023
55 2047

List of values

[1, 3, 3, 7, 9, 7, 15, 21, 21, 15, 31, 45, 49, 45, 31, 63, 93, 105, 105, 93, 63, 127, 189, 217, 225, 217, 189, 127, 255, 381, 441, 465, 465, 441, 381, 255, 511, 765, 889, 945, 961, 945, 889, 765, 511, 1023, 1533, 1785, 1905, 1953, 1953, 1905, 1785, 1533, 1023, 2047]