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

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A187133 Number of (n+1)X3 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces 1

%I

%S 171,1773,19062,182214,1853892,18740754,189091422,1908891288,

%T 19278208206,194645680218,1965399983316,19844830788804,

%U 200378939196348,2023260613838154,20429301340509606,206278735833598914

%N Number of (n+1)X3 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

%C Column 2 of A187140

%H R. H. Hardin, <a href="/A187133/b187133.txt">Table of n, a(n) for n = 1..200</a>

%F Empirical: a(n)=8*a(n-1)+7*a(n-2)+57*a(n-3)+830*a(n-4)-760*a(n-5)+13856*a(n-6)-16412*a(n-7)-20781*a(n-8)-279409*a(n-9)-286716*a(n-10)-177533*a(n-11)-1234545*a(n-12)+8386114*a(n-13)+27271210*a(n-14)+14619241*a(n-15)+23883593*a(n-16)-184245010*a(n-17)-273527466*a(n-18)-929089851*a(n-19)-1459165167*a(n-20)+7806772227*a(n-21)-3902405566*a(n-22)+12705482310*a(n-23)+66192396*a(n-24)-23799404280*a(n-25)-23221742848*a(n-26)-85333270112*a(n-27)+154491695232*a(n-28)+59114655488*a(n-29)+45146716672*a(n-30)-94877119488*a(n-31)-212159176704*a(n-32)+234619213824*a(n-33)-294853865472*a(n-34)+326049988608*a(n-35)-218420084736*a(n-36)+290221719552*a(n-37)-171228266496*a(n-38)

%e Some solutions for 4X3

%e ..2..2..0....0..1..2....0..2..0....1..0..0....0..2..2....1..1..1....1..2..0

%e ..2..0..0....1..1..1....0..1..1....1..0..2....0..2..0....2..1..0....1..2..0

%e ..0..0..2....1..0..1....1..1..2....0..0..2....2..2..1....1..0..0....1..2..0

%e ..1..1..1....1..1..2....0..0..2....2..1..1....0..1..1....1..1..1....1..2..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 05 2011

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.

Last modified November 24 20:34 EST 2020. Contains 338616 sequences. (Running on oeis4.)