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

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A253031 Number of (n+2)X(3+2) 0..2 arrays with every consecutive three elements in every row and column having exactly two distinct values, and new values 0 upwards introduced in row major order 1
 9126, 102060, 1134864, 12647772, 141199416, 1576282464, 17600380920, 196546814928, 2194907186304, 24511818033072, 273740816863008, 3057065649201024, 34140581558811360, 381274270682513472 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A253035 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 12*a(n-1) +8*a(n-2) -96*a(n-3) -1220*a(n-4) +332*a(n-5) +12548*a(n-6) +11360*a(n-7) -41384*a(n-8) -112608*a(n-9) +7728*a(n-10) +341792*a(n-11) +337408*a(n-12) -210560*a(n-13) -870400*a(n-14) -1209856*a(n-15) +668672*a(n-16) +2822144*a(n-17) +458752*a(n-18) -1933312*a(n-19) -851968*a(n-20) EXAMPLE Some solutions for n=2 ..0..1..1..2..1....0..1..1..2..2....0..1..1..2..2....0..0..1..0..0 ..1..1..0..0..2....0..0..2..0..0....2..2..0..0..2....0..1..1..0..1 ..0..2..0..0..1....1..0..1..0..0....2..1..1..2..1....2..0..2..2..0 ..1..2..2..1..2....1..2..1..1..2....0..1..0..0..1....0..1..1..2..1 CROSSREFS Sequence in context: A174983 A184381 A251376 * A093213 A205922 A256766 Adjacent sequences:  A253028 A253029 A253030 * A253032 A253033 A253034 KEYWORD nonn AUTHOR R. H. Hardin, Dec 26 2014 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 December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)