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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.

A108020 a(n) is the number whose binary representation is the concatenation of n strings of the four digits "1100".

Table of values

n a(n)
0 0
1 12
2 204
3 3276
4 52428
5 838860
6 13421772
7 214748364
8 3435973836
9 54975581388
10 879609302220
11 14073748835532
12 225179981368524
13 3602879701896396
14 57646075230342348
15 922337203685477580
16 14757395258967641292
17 236118324143482260684
18 3777893186295716170956

List of values

[0, 12, 204, 3276, 52428, 838860, 13421772, 214748364, 3435973836, 54975581388, 879609302220, 14073748835532, 225179981368524, 3602879701896396, 57646075230342348, 922337203685477580, 14757395258967641292, 236118324143482260684, 3777893186295716170956]

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

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