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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.

A087953 a(n) = floor((Fibonacci(2*n+1)+1)/2).

Table of values

n a(n)
0 1
1 1
2 3
3 7
4 17
5 45
6 117
7 305
8 799
9 2091
10 5473
11 14329
12 37513
13 98209
14 257115
15 673135
16 1762289
17 4613733
18 12078909
19 31622993
20 82790071
21 216747219
22 567451585
23 1485607537
24 3889371025
25 10182505537
26 26658145587
27 69791931223
28 182717648081
29 478361013021
30 1252365390981

List of values

[1, 1, 3, 7, 17, 45, 117, 305, 799, 2091, 5473, 14329, 37513, 98209, 257115, 673135, 1762289, 4613733, 12078909, 31622993, 82790071, 216747219, 567451585, 1485607537, 3889371025, 10182505537, 26658145587, 69791931223, 182717648081, 478361013021, 1252365390981]

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

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