OFFSET

0,3

COMMENTS

a(n) is even for all n > 1.

Is this sequence strictly increasing for n > 0?

LINKS

Programming Puzzles & Code Golf Stack Exchange, Permutations such that no k+2 points fall on any polynomial of degree k

EXAMPLE

For n = 4, the 18 different permutations are:

[1,2,4,3],[1,3,2,4],[1,3,4,2],[1,4,2,3],[2,1,3,4],[2,1,4,3],

[2,3,1,4],[2,4,1,3],[2,4,3,1],[3,1,2,4],[3,1,4,2],[3,2,4,1],

[3,4,1,2],[3,4,2,1],[4,1,3,2],[4,2,1,3],[4,2,3,1],[4,3,1,2].

CROSSREFS

KEYWORD

nonn,more

AUTHOR

Peter Kagey, Mar 26 2018

EXTENSIONS

a(0) and a(10)-a(12) from Peter J. Taylor, Mar 28 2018

STATUS

approved