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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.

A240926 a(n) = 2 + L(2*n) = 2 + A005248(n), n >= 0, with the Lucas numbers (A000032).

Table of values

n a(n)
0 4
1 5
2 9
3 20
4 49
5 125
6 324
7 845
8 2209
9 5780
10 15129
11 39605
12 103684
13 271445
14 710649
15 1860500
16 4870849
17 12752045
18 33385284
19 87403805
20 228826129
21 599074580
22 1568397609
23 4106118245
24 10749957124
25 28143753125
26 73681302249
27 192900153620
28 505019158609

List of values

[4, 5, 9, 20, 49, 125, 324, 845, 2209, 5780, 15129, 39605, 103684, 271445, 710649, 1860500, 4870849, 12752045, 33385284, 87403805, 228826129, 599074580, 1568397609, 4106118245, 10749957124, 28143753125, 73681302249, 192900153620, 505019158609]

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

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