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.

A381683 Triangle read by rows: T(n,k) = number of collections of up to k subsets of [n] covering [n], with [0]={}; n>=0, k=0..2^n.

Table of values

n a(n)
0 1
1 2
2 0
3 1
4 2
5 0
6 1
7 5
8 9
9 10
10 0
11 1
12 14
13 58
14 125
15 181
16 209
17 217
18 218
19 0
20 1
21 41
22 401
23 1947
24 6091
25 13987
26 25395
27 38261
28 49701
29 57709
30 62077
31 63897
32 64457
33 64577
34 64593
35 64594
36 0
37 1
38 122
39 2802
40 30352
41 210448
42 1076880
43 4385616
44 14839576
45 42831176
46 107303376
47 236306016
48 462089756
49 809460556
50 1280895556
51 1846618196
52 2447698581

List of values

[1, 2, 0, 1, 2, 0, 1, 5, 9, 10, 0, 1, 14, 58, 125, 181, 209, 217, 218, 0, 1, 41, 401, 1947, 6091, 13987, 25395, 38261, 49701, 57709, 62077, 63897, 64457, 64577, 64593, 64594, 0, 1, 122, 2802, 30352, 210448, 1076880, 4385616, 14839576, 42831176, 107303376, 236306016, 462089756, 809460556, 1280895556, 1846618196, 2447698581]