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!)
A204869 Number of (n+1)X2 0..3 arrays with the permanents of all 2X2 subblocks equal and nonzero 1
207, 551, 1467, 4245, 12241, 36285, 107397, 321317, 961553, 2892495, 8709757, 26307557, 79561225, 241132539, 731760333, 2224348229, 6769653545, 20631078401, 62945318613, 192268398395, 587883672713, 1799329855449, 5512184981437 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A204876

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) +21*a(n-2) -394*a(n-3) +151*a(n-4) +7966*a(n-5) -10808*a(n-6) -98823*a(n-7) +187286*a(n-8) +843135*a(n-9) -1900516*a(n-10) -5256667*a(n-11) +13199115*a(n-12) +24843520*a(n-13) -66813566*a(n-14) -91104356*a(n-15) +254330777*a(n-16) +263015193*a(n-17) -739407216*a(n-18) -602162617*a(n-19) +1650910282*a(n-20) +1093598055*a(n-21) -2824649042*a(n-22) -1563655353*a(n-23) +3668977540*a(n-24) +1731053069*a(n-25) -3556804939*a(n-26) -1443011892*a(n-27) +2506362226*a(n-28) +868301913*a(n-29) -1234756694*a(n-30) -354185298*a(n-31) +401490128*a(n-32) +88923284*a(n-33) -78797720*a(n-34) -11650360*a(n-35) +7965216*a(n-36) +539616*a(n-37) -282240*a(n-38)

EXAMPLE

Some solutions for n=4

..0..3....1..3....2..2....0..2....3..3....1..3....1..0....1..1....0..1....3..0

..1..1....2..2....1..2....3..3....3..2....2..1....2..1....2..0....1..0....1..2

..2..1....1..3....2..2....0..2....3..3....1..3....1..0....2..1....1..1....2..2

..3..0....2..2....2..1....3..2....3..2....2..1....1..1....2..0....0..1....0..3

..0..1....1..3....0..3....3..0....3..3....3..2....0..1....2..1....1..1....2..2

CROSSREFS

Sequence in context: A199497 A179171 A204876 * A217297 A205198 A205194

Adjacent sequences:  A204866 A204867 A204868 * A204870 A204871 A204872

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 20 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 October 18 18:03 EDT 2021. Contains 348068 sequences. (Running on oeis4.)