Logo

A001881 formatted as a simple table:

n a(n)
5 1
6 21
7 378
8 6930
9 135135
10 2837835
11 64324260
12 1571349780
13 41247931725
14 1159525191825
15 34785755754750
16 1109981842719750
17 37554385678684875
18 1343291487737574375 

[1,21,378,6930,135135,2837835,64324260,1571349780,
 41247931725,1159525191825,34785755754750,
 1109981842719750,37554385678684875,
 1343291487737574375]

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

AT&T Labs Research

Legal Notice
© 2009 AT&T Intellectual Property. All Rights Reserved.