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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.

A240671 a(n) = floor(4^n/(2+2*cos(2*Pi/7))^n).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 2
6 3
7 4
8 5
9 6
10 8
11 9
12 12
13 15
14 18
15 22
16 28
17 34
18 42
19 52
20 64
21 79
22 98
23 121
24 149
25 183
26 226
27 279
28 343
29 423
30 521
31 642
32 791
33 975
34 1201
35 1480
36 1823
37 2246
38 2767
39 3409
40 4199
41 5173
42 6373
43 7851
44 9672
45 11915
46 14679
47 18083

List of values

[1, 1, 1, 1, 2, 2, 3, 4, 5, 6, 8, 9, 12, 15, 18, 22, 28, 34, 42, 52, 64, 79, 98, 121, 149, 183, 226, 279, 343, 423, 521, 642, 791, 975, 1201, 1480, 1823, 2246, 2767, 3409, 4199, 5173, 6373, 7851, 9672, 11915, 14679, 18083]

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

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