The OEIS is supported by the many generous donors to the OEIS 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 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A231082 Number of 3Xn 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero 1
 0, 2, 50, 136, 2820, 38000, 421920, 6118120, 80521240, 1094128296, 15096212664, 206478042568, 2844940947752, 39196681965960, 540088040101912, 7448443982546312, 102716411297423656, 1416714539550709832 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 3 of A231080 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 16*a(n-1) -22*a(n-2) +202*a(n-3) -4786*a(n-4) +10954*a(n-5) -108876*a(n-6) +494726*a(n-7) -867601*a(n-8) +5712046*a(n-9) -8074486*a(n-10) +12131984*a(n-11) -53462460*a(n-12) -197644232*a(n-13) -17742728*a(n-14) -134970336*a(n-15) +1087452416*a(n-16) +2848787264*a(n-17) -3062176448*a(n-18) +24945118592*a(n-19) -26105584256*a(n-20) -10840879872*a(n-21) -37458373632*a(n-22) +16021963776*a(n-23) +13901665280*a(n-24) +34409371648*a(n-25) +2558844928*a(n-26) -74692345856*a(n-27) +18690605056*a(n-28) +56174247936*a(n-29) +5405671424*a(n-30) -17857249280*a(n-31) -23081254912*a(n-32) +14482931712*a(n-33) -486539264*a(n-34) -268435456*a(n-35) EXAMPLE Some solutions for n=3 ..0..3..2....0..1..2....0..1..2....0..1..2....0..1..0....0..3..0....0..1..0 ..2..1..2....0..3..2....2..3..2....0..3..2....2..3..2....0..1..2....0..3..2 ..0..3..0....2..1..2....2..1..0....2..1..0....2..1..0....2..3..2....0..1..2 CROSSREFS Sequence in context: A050800 A231051 A317819 * A318426 A265962 A318094 Adjacent sequences: A231079 A231080 A231081 * A231083 A231084 A231085 KEYWORD nonn AUTHOR R. H. Hardin, Nov 03 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 5 19:03 EST 2023. Contains 367593 sequences. (Running on oeis4.)