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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.

A194583 Triangle T(n,k) with T(n,0)=1 and T(n,k) = (2^(n+1)-2^k)*T(n,k-1) + T(n+1,k-1) otherwise.

Table of values

n a(n)
0 1
1 1
2 3
3 1
4 7
5 43
6 1
7 15
8 211
9 2619
10 1
11 31
12 931
13 26251
14 654811
15 1
16 63
17 3907
18 234795
19 13255291
20 662827803
21 1
22 127
23 16003
24 1985131
25 238658491
26 26961325147
27 2699483026843
28 1
29 255
30 64771
31 16323819
32 4050110011
33 973958217435
34 220115609012251
35 44102911693372059
36 1
37 511
38 260611
39 132393451
40 66733574971
41 33115631264731
42 15928113739803931
43 7200501591899676571
44 2886238576935227688091

List of values

[1, 1, 3, 1, 7, 43, 1, 15, 211, 2619, 1, 31, 931, 26251, 654811, 1, 63, 3907, 234795, 13255291, 662827803, 1, 127, 16003, 1985131, 238658491, 26961325147, 2699483026843, 1, 255, 64771, 16323819, 4050110011, 973958217435, 220115609012251, 44102911693372059, 1, 511, 260611, 132393451, 66733574971, 33115631264731, 15928113739803931, 7200501591899676571, 2886238576935227688091]