A229560 Number of arrays of length n that are sums of 2 consecutive elements of length n+1 permutations of 0..n.

1, 6, 16, 120, 648, 5040, 38592, 362880, 3600000, 39916800, 476928000, 6227020800, 87127488000, 1307674368000

Offset

1,2

Comments

Column 2 of A229565.

Links

Table of n, a(n) for n=1..14.

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

Adjacent sequences: A229557 A229558 A229559 * A229561 A229562 A229563

Keyword

nonn,more

Author

R. H. Hardin, Sep 26 2013

Status

approved