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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.

A052734 a(n) = 4^(n-1) * n! * Catalan(n-1) for n > 0, with a(0) = 0.

Table of values

n a(n)
0 0
1 1
2 8
3 192
4 7680
5 430080
6 30965760
7 2724986880
8 283398635520
9 34007836262400
10 4625065731686400
11 703009991216332800
12 118105678524343910400
13 21731444848479279513600
14 4346288969695855902720000
15 938798417454304874987520000
16 217801232849398730997104640000
17 54014705746650885287281950720000
18 14259882317115833715842434990080000

List of values

[0, 1, 8, 192, 7680, 430080, 30965760, 2724986880, 283398635520, 34007836262400, 4625065731686400, 703009991216332800, 118105678524343910400, 21731444848479279513600, 4346288969695855902720000, 938798417454304874987520000, 217801232849398730997104640000, 54014705746650885287281950720000, 14259882317115833715842434990080000]

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

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