This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A230708 T(n,k)=Number of (n+3)X(k+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero 10
 2, 8, 8, 30, 28, 30, 102, 244, 244, 102, 348, 800, 2106, 800, 348, 1172, 6576, 16536, 16536, 6576, 1172, 3956, 21076, 130446, 121382, 130446, 21076, 3956, 13326, 173428, 1025430, 2382398, 2382398, 1025430, 173428, 13326, 44916, 554040, 8053490 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts .....2......8.......30........102..........348...........1172.............3956 .....8.....28......244........800.........6576..........21076...........173428 ....30....244.....2106......16536.......130446........1025430..........8053490 ...102....800....16536.....121382......2382398.......17497342........342031378 ...348...6576...130446....2382398.....43853402......801845362......14669811856 ..1172..21076..1025430...17497342....801845362....13663471254.....625553036008 ..3956.173428..8053490..342031378..14669811856...625553036008...26681634560690 .13326.554040.63237238.2508344646.268320990890.10652997961328.1137681116923966 LINKS R. H. Hardin, Table of n, a(n) for n = 1..219 FORMULA Empirical for column k: k=1: a(n) = 3*a(n-1) +3*a(n-2) -6*a(n-3) +a(n-5) k=2: a(n) = 31*a(n-2) -126*a(n-4) +42*a(n-6) +79*a(n-8) -a(n-10) +8*a(n-12) k=3: [order 22] k=4: [order 50] EXAMPLE Some solutions for n=2 k=4 ..0..x..2..x..2..x..0....0..x..2..x..2..x..2....0..x..0..x..2..x..0 ..x..1..x..0..x..1..x....x..1..x..0..x..0..x....x..1..x..0..x..1..x ..0..x..1..x..2..x..0....0..x..0..x..1..x..2....1..x..2..x..1..x..1 ..x..2..x..0..x..1..x....x..2..x..2..x..1..x....x..2..x..1..x..2..x ..1..x..1..x..0..x..0....1..x..1..x..0..x..0....1..x..0..x..0..x..1 CROSSREFS Sequence in context: A146749 A250313 A180825 * A230739 A227326 A064231 Adjacent sequences:  A230705 A230706 A230707 * A230709 A230710 A230711 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Oct 28 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 | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 19 10:48 EST 2018. Contains 317349 sequences. (Running on oeis4.)