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.

A248470 Put a [+] b = A(A(a) + A(b)), where A = A007913; a(n) is the [+]-sum of binomial(n,i), i=0,...,n.

Table of values

n a(n)
0 1
1 2
2 1
3 2
4 1
5 2
6 3
7 2
8 1
9 1
10 6
11 38
12 167
13 2095
14 1
15 2030
16 3
17 15
18 21
19 138
20 263
21 2
22 57
23 1266
24 3470
25 7
26 145742
27 10
28 4682335
29 110
30 38
31 618
32 366
33 83
34 3343
35 3279
36 206555
37 215547
38 489378
39 52010
40 21
41 5127
42 11
43 54663
44 6203
45 5041187
46 194
47 63038411
48 407039
49 7602
50 2
51 2474

List of values

[1, 2, 1, 2, 1, 2, 3, 2, 1, 1, 6, 38, 167, 2095, 1, 2030, 3, 15, 21, 138, 263, 2, 57, 1266, 3470, 7, 145742, 10, 4682335, 110, 38, 618, 366, 83, 3343, 3279, 206555, 215547, 489378, 52010, 21, 5127, 11, 54663, 6203, 5041187, 194, 63038411, 407039, 7602, 2, 2474]