cp's OEIS Frontend

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.

A049680 a(n) = (L(n) + L(2*n))/2, where L = A000032 (the Lucas sequence).

Table of values

n a(n)
0 2
1 2
2 5
3 11
4 27
5 67
6 170
7 436
8 1127
9 2927
10 7625
11 19901
12 52002
13 135982
14 355745
15 930931
16 2436527
17 6377807
18 16695530
19 43706576
20 114420627
21 299549527
22 784218605
23 2053091161
24 5375030402
25 14071960442
26 36840786845
27 96450296411
28 252509934627
29 661079236027
30 1730727334250

List of values

[2, 2, 5, 11, 27, 67, 170, 436, 1127, 2927, 7625, 19901, 52002, 135982, 355745, 930931, 2436527, 6377807, 16695530, 43706576, 114420627, 299549527, 784218605, 2053091161, 5375030402, 14071960442, 36840786845, 96450296411, 252509934627, 661079236027, 1730727334250]

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

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