The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A215872 Number of permutations of 0..floor((4*n-2)/2) on odd squares of an 4Xn array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing 0
 1, 1, 1, 4, 10, 78, 262, 3001, 11694, 170594, 727846, 12517074, 56797272, 1100044792, 5219906670, 110598847073, 542976951374, 12341741030502 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Row 4 of A215870 LINKS Table of n, a(n) for n=1..18. EXAMPLE Some solutions for n=5 ..x..0..x..2..x....x..0..x..2..x....x..0..x..2..x....x..0..x..2..x ..1..x..3..x..5....1..x..3..x..5....1..x..3..x..6....1..x..3..x..4 ..x..4..x..6..x....x..4..x..7..x....x..4..x..7..x....x..5..x..7..x ..7..x..8..x..9....6..x..8..x..9....5..x..8..x..9....6..x..8..x..9 CROSSREFS Sequence in context: A152397 A239502 A171754 * A059919 A143047 A156329 Adjacent sequences: A215869 A215870 A215871 * A215873 A215874 A215875 KEYWORD nonn AUTHOR R. H. Hardin Aug 25 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 21 21:03 EDT 2023. Contains 365503 sequences. (Running on oeis4.)