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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.

A138653 a(n) = 3*a(n-1)-3*a(n-2)+a(n-3)+a(n-4).

Table of values

n a(n)
0 1
1 2
2 4
3 8
4 15
5 27
6 48
7 86
8 156
9 285
10 521
11 950
12 1728
13 3140
14 5707
15 10379
16 18884
17 34362
18 62520
19 113737
20 206897
21 376362
22 684652
23 1245504
24 2265815
25 4121947
26 7498552
27 13641134
28 24815508
29 45143621
30 82124025
31 149397854
32 271780616
33 494415932
34 899427827
35 1636214155

List of values

[1, 2, 4, 8, 15, 27, 48, 86, 156, 285, 521, 950, 1728, 3140, 5707, 10379, 18884, 34362, 62520, 113737, 206897, 376362, 684652, 1245504, 2265815, 4121947, 7498552, 13641134, 24815508, 45143621, 82124025, 149397854, 271780616, 494415932, 899427827, 1636214155]

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

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