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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.

A373639 a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-5*k,k).

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 4
5 6
6 9
7 16
8 27
9 43
10 71
11 119
12 196
13 322
14 533
15 882
16 1455
17 2402
18 3970
19 6558
20 10829
21 17887
22 29548
23 48804
24 80608
25 133146
26 219925
27 363254
28 599998
29 991044
30 1636944
31 2703794
32 4465957
33 7376591
34 12184181
35 20125051
36 33241289
37 54905857
38 90690002
39 149795989

List of values

[1, 1, 1, 2, 4, 6, 9, 16, 27, 43, 71, 119, 196, 322, 533, 882, 1455, 2402, 3970, 6558, 10829, 17887, 29548, 48804, 80608, 133146, 219925, 363254, 599998, 991044, 1636944, 2703794, 4465957, 7376591, 12184181, 20125051, 33241289, 54905857, 90690002, 149795989]

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

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