cp's OEIS Frontend

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.

A172018 a(n) = A142458(2*n-1, n)/n.

Table of values

n a(n)
1 1
2 4
3 182
4 27410
5 8890310
6 5051270688
7 4459786293372
8 5659222645997646
9 9770821427711370950
10 22041005972637205198568
11 62967534725721252354766676
12 222256499446324679350316816644
13 950020052553444052606973276792092
14 4836606673194788521307702032786510240
15 28920975283745982162014025622769293094712

List of values

[1, 4, 182, 27410, 8890310, 5051270688, 4459786293372, 5659222645997646, 9770821427711370950, 22041005972637205198568, 62967534725721252354766676, 222256499446324679350316816644, 950020052553444052606973276792092, 4836606673194788521307702032786510240, 28920975283745982162014025622769293094712]

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

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