login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A205994 Number of (n+1)X5 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero 1
1184, 14866, 189430, 2437024, 31326018, 403768668, 5195655486, 66947088104, 861764789094, 11101218786716, 142925095236492, 1840894346159884, 23703493987332650, 305280014387629340, 3931041030713379578 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A205998

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 9*a(n-1) +129*a(n-2) -959*a(n-3) -2642*a(n-4) +23760*a(n-5) +29110*a(n-6) -294329*a(n-7) -233474*a(n-8) +2089321*a(n-9) +1217510*a(n-10) -7615126*a(n-11) -4368220*a(n-12) +12862612*a(n-13) -84886*a(n-14) -22987038*a(n-15) +4272374*a(n-16) +30922371*a(n-17) +17506373*a(n-18) +7832373*a(n-19) -2220854*a(n-20) -17869842*a(n-21) -12972492*a(n-22) -5160865*a(n-23) -3810944*a(n-24) +4001127*a(n-25) +3976405*a(n-26) -1150220*a(n-27) -615736*a(n-28) +213944*a(n-29) +46224*a(n-30) +19196*a(n-31) +18136*a(n-32) -1136*a(n-33) -1296*a(n-34) -128*a(n-35) +64*a(n-36)

EXAMPLE

Some solutions for n=4

..0..1..2..2..1....2..1..2..2..0....2..1..0..2..0....0..2..0..1..1

..1..2..1..0..2....0..2..1..0..1....0..2..1..0..2....2..0..2..0..2

..1..0..2..1..0....2..0..2..1..0....1..0..2..1..0....2..1..0..1..0

..0..1..0..2..1....1..1..0..2..1....2..1..0..2..1....1..2..1..2..1

..1..2..1..0..2....0..2..1..0..2....0..2..1..0..2....0..1..2..0..2

CROSSREFS

Sequence in context: A269017 A328064 A280516 * A237698 A052236 A342066

Adjacent sequences:  A205991 A205992 A205993 * A205995 A205996 A205997

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 02 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 15 18:26 EDT 2021. Contains 343920 sequences. (Running on oeis4.)