This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A183495 Half the number of n X 2 0..2 arrays with no element equal to the sum mod 3 of its horizontal and vertical neighbors. 1
 3, 9, 36, 128, 540, 2048, 8256, 32784, 131328, 524288, 2098368, 8388608, 33558528, 134217984, 536887296, 2147483648, 8590003200, 34359738368, 137439215616, 549755817984, 2199024304128, 8796093022208, 35184376332288, 140737488355328 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A183501. LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 FORMULA Empirical: a(n) = 4*a(n-1) + 4*a(n-2) - 16*a(n-3) + 16*a(n-6) - 64*a(n-7) - 64*a(n-8) + 256*a(n-9) Empirical g.f.: x*(3 - 3*x - 12*x^2 - 4*x^3 + 28*x^4 - 48*x^5 - 96*x^6 + 256*x^7 + 128*x^8) / ((1 - 2*x)*(1 + 2*x)*(1 - 4*x)*(1 - 4*x^3)*(1 + 4*x^3)). - Colin Barker, Mar 29 2018 EXAMPLE Some solutions for 3 X 2: ..0..2....1..0....2..0....1..1....2..1....1..1....2..0....0..0....0..0....1..2 ..2..1....2..1....0..0....1..1....0..0....1..2....0..0....1..2....1..1....0..0 ..0..2....2..1....0..2....1..1....2..0....2..2....2..1....1..2....2..2....1..2 CROSSREFS Cf. A183501. Sequence in context: A149020 A187980 A057390 * A185162 A106435 A276368 Adjacent sequences:  A183492 A183493 A183494 * A183496 A183497 A183498 KEYWORD nonn AUTHOR R. H. Hardin, Jan 05 2011 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.

Last modified October 15 01:40 EDT 2019. Contains 328025 sequences. (Running on oeis4.)