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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.

A368893 a(n) = Sum_{k=0..floor(n/3)} n^(n-2*k) * binomial(n-2*k,k).

Table of values

n a(n)
0 1
1 1
2 4
3 30
4 288
5 3500
6 51876
7 908607
8 18374656
9 421492491
10 10815040000
11 306944040931
12 9547373318400
13 322972830958648
14 11805432990665664
15 463673398064821875
16 19474259980847153152
17 870954834559130974358
18 41323803842611198131264

List of values

[1, 1, 4, 30, 288, 3500, 51876, 908607, 18374656, 421492491, 10815040000, 306944040931, 9547373318400, 322972830958648, 11805432990665664, 463673398064821875, 19474259980847153152, 870954834559130974358, 41323803842611198131264]

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

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