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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.

A210726 a(2)=1, a(3)=2; thereafter a(n) = 2a(n-1)-a(n-2)+A046919(n).

Table of values

n a(n)
2 1
3 2
4 4
5 9
6 22
7 59
8 169
9 506
10 1577
11 5078
12 16729
13 56098
14 190981
15 658442
16 2294164
17 8066363
18 28588554
19 102036631
20 366458118
21 1323463507
22 4803734390
23 17515357533
24 64128879398
25 235682969485
26 869175349090
27 3215674910037
28 11932102898252
29 44396448313385
30 165608308422048
31 619217961493403
32 2320410595131693
33 8713343724905902
34 32782954997996347
35 123567462151713252
36 466559336920866937
37 1764469819249171154

List of values

[1, 2, 4, 9, 22, 59, 169, 506, 1577, 5078, 16729, 56098, 190981, 658442, 2294164, 8066363, 28588554, 102036631, 366458118, 1323463507, 4803734390, 17515357533, 64128879398, 235682969485, 869175349090, 3215674910037, 11932102898252, 44396448313385, 165608308422048, 619217961493403, 2320410595131693, 8713343724905902, 32782954997996347, 123567462151713252, 466559336920866937, 1764469819249171154]

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