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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.

A368891 a(n) = Sum_{k=0..floor(n/3)} n^k * binomial(n-2*k,k).

Table of values

n a(n)
0 1
1 1
2 1
3 4
4 9
5 16
6 61
7 183
8 433
9 1603
10 5581
11 15951
12 59449
13 225928
14 738893
15 2827321
16 11387617
17 41174086
18 163185805
19 686315474
20 2680560361
21 11035625413
22 48086847117
23 199640217719
24 853587430801
25 3836667616201
26 16739402030989
27 74206353913480

List of values

[1, 1, 1, 4, 9, 16, 61, 183, 433, 1603, 5581, 15951, 59449, 225928, 738893, 2827321, 11387617, 41174086, 163185805, 686315474, 2680560361, 11035625413, 48086847117, 199640217719, 853587430801, 3836667616201, 16739402030989, 74206353913480]

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

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