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.

A237580 a(n) = (2n)! - n! + 1.

Table of values

n a(n)
0 1
1 2
2 23
3 715
4 40297
5 3628681
6 479000881
7 87178286161
8 20922789847681
9 6402373705365121
10 2432902008173011201
11 1124000727777567763201
12 620448401733238960358401
13 403291461126605629356979201
14 304888344611713860414325708801
15 265252859812191058635000805632001

List of values

[1, 2, 23, 715, 40297, 3628681, 479000881, 87178286161, 20922789847681, 6402373705365121, 2432902008173011201, 1124000727777567763201, 620448401733238960358401, 403291461126605629356979201, 304888344611713860414325708801, 265252859812191058635000805632001]

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

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