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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.

A373653 a(n) = Sum_{k=0..floor(n/2)} binomial(3*n-5*k-1,k).

Table of values

n a(n)
0 1
1 1
2 1
3 4
4 7
5 16
6 34
7 71
8 153
9 322
10 686
11 1455
12 3088
13 6558
14 13917
15 29548
16 62721
17 133146
18 282646
19 599998
20 1273690
21 2703794
22 5739647
23 12184181
24 25864698
25 54905857
26 116554700
27 247423522
28 525233175
29 1114970351
30 2366870474
31 5024416818
32 10665883415
33 22641646338

List of values

[1, 1, 1, 4, 7, 16, 34, 71, 153, 322, 686, 1455, 3088, 6558, 13917, 29548, 62721, 133146, 282646, 599998, 1273690, 2703794, 5739647, 12184181, 25864698, 54905857, 116554700, 247423522, 525233175, 1114970351, 2366870474, 5024416818, 10665883415, 22641646338]

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

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