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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.

A246641 Sequence a(n) = (1 + A007805(n))/2, appearing in a certain touching problem for three circles and a chord, together with A007805.

Table of values

n a(n)
0 1
1 9
2 153
3 2737
4 49105
5 881145
6 15811497
7 283725793
8 5091252769
9 91358824041
10 1639367579961
11 29417257615249
12 527871269494513
13 9472265593285977
14 169972909409653065
15 3050040103780469185
16 54730748958638792257
17 982103441151717791433
18 17623131191772281453529
19 316234258010749348372081
20 5674593513001715989243921

List of values

[1, 9, 153, 2737, 49105, 881145, 15811497, 283725793, 5091252769, 91358824041, 1639367579961, 29417257615249, 527871269494513, 9472265593285977, 169972909409653065, 3050040103780469185, 54730748958638792257, 982103441151717791433, 17623131191772281453529, 316234258010749348372081, 5674593513001715989243921]

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

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