cp's OEIS Frontend

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.

A098576 a(n) = Sum_{k=0..floor(n/4)} C(n-2*k,2*k) * 3^k.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 4
5 10
6 19
7 31
8 55
9 109
10 220
11 424
12 793
13 1489
14 2845
15 5473
16 10480
17 19954
18 37963
19 72391
20 138259
21 263989
22 503608
23 960400
24 1831969
25 3495505
26 6669865
27 12725425
28 24276892
29 46314874
30 88362451
31 168586303
32 321640831
33 613639981
34 1170726484

List of values

[1, 1, 1, 1, 4, 10, 19, 31, 55, 109, 220, 424, 793, 1489, 2845, 5473, 10480, 19954, 37963, 72391, 138259, 263989, 503608, 960400, 1831969, 3495505, 6669865, 12725425, 24276892, 46314874, 88362451, 168586303, 321640831, 613639981, 1170726484]

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

Content is available under The OEIS End-User License Agreement.