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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.

A192574 a(n) = Sum_{k=0..n} binomial(n,k)*floor(sqrt(Bell(k)))*floor(sqrt(Bell(n-k))).

Table of values

n a(n)
0 1
1 2
2 4
3 10
4 28
5 84
6 282
7 968
8 3574
9 13526
10 53248
11 215288
12 889072
13 3749808
14 16120368
15 70569136
16 314384296
17 1424490556
18 6561255338
19 30706715780
20 145947430208
21 704170163362
22 3447329246534
23 17116783509170
24 86161074446406
25 439511863198824
26 2271055875812692

List of values

[1, 2, 4, 10, 28, 84, 282, 968, 3574, 13526, 53248, 215288, 889072, 3749808, 16120368, 70569136, 314384296, 1424490556, 6561255338, 30706715780, 145947430208, 704170163362, 3447329246534, 17116783509170, 86161074446406, 439511863198824, 2271055875812692]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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