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!)
 A204600 Number of (n+2)X3 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally, vertically or nw-to-se diagonally exactly one way 1
 3562, 29678, 328845, 2275645, 16247580, 153711850, 1240455298, 9111381604, 76764201360, 642774112145, 4970541781364, 39956500934443, 331362692034969, 2645811447632755, 21088097910525745, 172146633446959131 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 1 of A204607 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 307*a(n-3) +1269*a(n-4) +3014*a(n-5) +3034*a(n-6) +25372*a(n-7) +79370*a(n-8) +86184*a(n-9) -18348*a(n-10) +325463*a(n-11) +986531*a(n-12) -990300*a(n-13) -1055430*a(n-14) +897607*a(n-15) -320293*a(n-16) -227770*a(n-17) +280127*a(n-18) +510823*a(n-19) +29680*a(n-20) -200892*a(n-21) -53919*a(n-22) +324*a(n-23) +5832*a(n-24) EXAMPLE Some solutions for n=3 ..1..1..1....1..1..2....1..1..2....0..1..1....2..0..1....2..0..1....0..1..1 ..2..1..1....0..2..2....0..1..2....2..2..2....2..0..1....2..0..2....0..0..1 ..0..1..2....0..1..2....2..1..1....0..1..2....0..1..2....0..1..2....0..1..2 ..2..1..2....0..1..1....1..1..0....0..2..1....1..0..0....1..0..2....1..0..1 ..2..1..0....1..1..1....0..1..2....2..1..1....1..2..2....1..0..2....1..2..1 CROSSREFS Sequence in context: A104207 A107646 A204607 * A204599 A206090 A357590 Adjacent sequences: A204597 A204598 A204599 * A204601 A204602 A204603 KEYWORD nonn AUTHOR R. H. Hardin Jan 17 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 5 23:11 EST 2023. Contains 367594 sequences. (Running on oeis4.)