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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.

A368892 a(n) = Sum_{k=0..floor(n/3)} n^(n-3*k) * binomial(n-2*k,k).

Table of values

n a(n)
0 1
1 1
2 4
3 28
4 264
5 3200
6 47521
7 835569
8 16974208
9 391147867
10 10080150040
11 287244283821
12 8967781893889
13 304393809948904
14 11160668048222588
15 439582708115133751
16 18509867068477014112
17 829768603643818659302
18 39454459640462073466945

List of values

[1, 1, 4, 28, 264, 3200, 47521, 835569, 16974208, 391147867, 10080150040, 287244283821, 8967781893889, 304393809948904, 11160668048222588, 439582708115133751, 18509867068477014112, 829768603643818659302, 39454459640462073466945]

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

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