

A175176


Number of vector sums of two permutations of 1,2,...,n.


0




OFFSET

1,2


COMMENTS

Also, number of vector differences of two permutations of 1,2,...,n.


LINKS

Table of n, a(n) for n=1..10.


EXAMPLE

The permutation sums for n=2 are (1,2) + (1,2) = (2,4); (1,2) + (2,1) = (2,1) + (1,2) = (3,3); (2,1) + (2,1) = (4,2); so a(2)=3.


CROSSREFS

Sequence in context: A288693 A195895 A127502 * A233336 A208897 A027546
Adjacent sequences: A175173 A175174 A175175 * A175177 A175178 A175179


KEYWORD

nonn,more


AUTHOR

R. H. Hardin Feb 28 2010


STATUS

approved



