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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.

A045868 Expansion of g.f.: ((1 - x - sqrt(1-6*x+5*x^2))/(2*x))^2.

Table of values

n a(n)
0 1
1 2
2 7
3 26
4 101
5 406
6 1676
7 7066
8 30302
9 131782
10 579867
11 2576982
12 11550237
13 52152330
14 237005385
15 1083211410
16 4975796735
17 22960105510
18 106377393365
19 494674698190
20 2308015808015
21 10801388134690
22 50691017885290
23 238503869991926
24 1124828963516896
25 5316520644648026
26 25179670936870021

List of values

[1, 2, 7, 26, 101, 406, 1676, 7066, 30302, 131782, 579867, 2576982, 11550237, 52152330, 237005385, 1083211410, 4975796735, 22960105510, 106377393365, 494674698190, 2308015808015, 10801388134690, 50691017885290, 238503869991926, 1124828963516896, 5316520644648026, 25179670936870021]

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

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