login
A229560
Number of arrays of length n that are sums of 2 consecutive elements of length n+1 permutations of 0..n.
0
1, 6, 16, 120, 648, 5040, 38592, 362880, 3600000, 39916800, 476928000, 6227020800, 87127488000, 1307674368000
OFFSET
1,2
COMMENTS
Column 2 of A229565.
EXAMPLE
All solutions for n=3:
1 3 5 3 4 4 5 4 1 3 5 2 2 3 2 1
4 5 2 2 1 3 4 5 3 1 3 1 3 4 5 2
5 3 1 3 2 2 1 2 5 3 1 4 4 3 4 5
CROSSREFS
Sequence in context: A218976 A173737 A152663 * A113561 A347923 A080809
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Sep 26 2013
STATUS
approved