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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.

A206723 a(n) = 7*( ((3 + sqrt(5))/2)^n + ((3 - sqrt(5))/2)^n - 2 ).

Table of values

n a(n)
1 7
2 35
3 112
4 315
5 847
6 2240
7 5887
8 15435
9 40432
10 105875
11 277207
12 725760
13 1900087
14 4974515
15 13023472
16 34095915
17 89264287
18 233696960
19 611826607
20 1601782875
21 4193522032
22 10978783235
23 28742827687
24 75249699840
25 197006271847
26 515769115715
27 1350301075312
28 3535134110235
29 9255101255407
30 24230169656000
31 63435407712607
32 166076053481835
33 434792752732912

List of values

[7, 35, 112, 315, 847, 2240, 5887, 15435, 40432, 105875, 277207, 725760, 1900087, 4974515, 13023472, 34095915, 89264287, 233696960, 611826607, 1601782875, 4193522032, 10978783235, 28742827687, 75249699840, 197006271847, 515769115715, 1350301075312, 3535134110235, 9255101255407, 24230169656000, 63435407712607, 166076053481835, 434792752732912]

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

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