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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.

A099572 a(n) = Sum_{k=0..floor(n/2)} binomial(n-k+4, k).

Table of values

n a(n)
0 1
1 1
2 6
3 7
4 23
5 30
6 73
7 103
8 211
9 314
10 581
11 895
12 1560
13 2455
14 4135
15 6590
16 10890
17 17480
18 28590
19 46070
20 74946
21 121016
22 196326
23 317342
24 514123
25 831465
26 1346148
27 2177613
28 3524441
29 5702054
30 9227311
31 14929365
32 24157645
33 39087010
34 63245795
35 102332805

List of values

[1, 1, 6, 7, 23, 30, 73, 103, 211, 314, 581, 895, 1560, 2455, 4135, 6590, 10890, 17480, 28590, 46070, 74946, 121016, 196326, 317342, 514123, 831465, 1346148, 2177613, 3524441, 5702054, 9227311, 14929365, 24157645, 39087010, 63245795, 102332805]

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

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