The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A264315 Number of (2+1)X(n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,0 0,1 1,0 -1,-2 or 0,2. 1
1, 20, 139, 735, 4103, 24153, 137703, 781453, 4441735, 25301221, 144075295, 820164205, 4668417719, 26575597941, 151287649935, 861229928957, 4902653550311, 27908998988293, 158875877400831, 904423174974925 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 2 of A264313.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) +10*a(n-2) +18*a(n-3) +72*a(n-4) +40*a(n-5) -152*a(n-6) -728*a(n-7) -400*a(n-8) +1008*a(n-9) +704*a(n-10) +192*a(n-11)
EXAMPLE
Some solutions for n=4
..0..8..1..3..2....7..0..1..3..4....0..1..9..3..2....0..1..9..2..4
.12..6.14..7..4...12..5..2..8..9....5..6.14..8..4....5..6.14..3..8
..5.11.10.13..9...10..6.11.13.14...10.11..7.13.12...10.11..7.13.12
CROSSREFS
Cf. A264313.
Sequence in context: A144965 A262140 A140301 * A264308 A328174 A236988
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 11 2015
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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 18 01:32 EDT 2024. Contains 373468 sequences. (Running on oeis4.)