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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.

A228899 Triangle defined by g.f. A(x,y) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n, k)^(k+1) * y^k ), as read by rows.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 3
5 1
6 1
7 6
8 12
9 1
10 1
11 10
12 71
13 76
14 1
15 1
16 15
17 281
18 2153
19 701
20 1
21 1
22 21
23 861
24 29166
25 129509
26 8477
27 1
28 1
29 28
30 2212
31 244725
32 7664343
33 12391414
34 126126
35 1
36 1
37 36
38 4998
39 1477391
40 218030412
41 3875325345
42 1699148352
43 2223278
44 1
45 1
46 45
47 10242
48 7017577
49 3748460115
50 448713017405
51 3284369541969
52 315158247170
53 45269999
54 1

List of values

[1, 1, 1, 1, 3, 1, 1, 6, 12, 1, 1, 10, 71, 76, 1, 1, 15, 281, 2153, 701, 1, 1, 21, 861, 29166, 129509, 8477, 1, 1, 28, 2212, 244725, 7664343, 12391414, 126126, 1, 1, 36, 4998, 1477391, 218030412, 3875325345, 1699148352, 2223278, 1, 1, 45, 10242, 7017577, 3748460115, 448713017405, 3284369541969, 315158247170, 45269999, 1]