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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.

A002537 a(2n) = a(2n-1) + 3a(2n-2), a(2n+1) = 2a(2n) + 3a(2n-1).

Table of values

n a(n)
0 1
1 1
2 4
3 11
4 23
5 79
6 148
7 533
8 977
9 3553
10 6484
11 23627
12 43079
13 157039
14 286276
15 1043669
16 1902497
17 6936001
18 12643492
19 46094987
20 84025463
21 306335887
22 558412276
23 2035832213
24 3711069041
25 13529634721
26 24662841844
27 89914587851

List of values

[1, 1, 4, 11, 23, 79, 148, 533, 977, 3553, 6484, 23627, 43079, 157039, 286276, 1043669, 1902497, 6936001, 12643492, 46094987, 84025463, 306335887, 558412276, 2035832213, 3711069041, 13529634721, 24662841844, 89914587851]

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

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