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

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A232368 T(n,k)=Number of nXk 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or vertically 7
 1, 3, 3, 7, 23, 7, 15, 145, 145, 15, 33, 887, 2411, 887, 33, 73, 5487, 39321, 39321, 5487, 73, 161, 33957, 647287, 1704619, 647287, 33957, 161, 355, 210039, 10652849, 74665511, 74665511, 10652849, 210039, 355, 783, 1299219, 175284259, 3271362341 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Table starts ...1.......3..........7............15................33...................73 ...3......23........145...........887..............5487................33957 ...7.....145.......2411.........39321............647287.............10652849 ..15.....887......39321.......1704619..........74665511...........3271362341 ..33....5487.....647287......74665511........8716796353........1017627171097 ..73...33957...10652849....3271362341.....1017627171097......316516682114845 .161..210039..175284259..143280358783...118759183620445....98411994699167317 .355.1299219.2884208601.6275473692531.13859593192739275.30598926533212575781 LINKS R. H. Hardin, Table of n, a(n) for n = 1..144 FORMULA Empirical for column k: k=1: a(n) = 2*a(n-1) +a(n-3) k=2: a(n) = 5*a(n-1) +6*a(n-2) +8*a(n-3) +3*a(n-4) -8*a(n-5) -5*a(n-6) k=3: [order 21] k=4: [order 60] EXAMPLE Some solutions for n=3 k=4 ..0..1..2..2....1..0..2..1....2..2..1..0....1..2..1..1....2..1..2..1 ..2..1..1..2....2..1..0..1....0..1..1..1....0..1..2..2....1..1..2..2 ..1..2..2..1....2..1..1..2....2..2..2..2....2..2..2..1....2..0..2..2 CROSSREFS Column 1 is A193641 Column 2 is A232145 Sequence in context: A046631 A100666 A262375 * A333924 A173321 A191498 Adjacent sequences:  A232365 A232366 A232367 * A232369 A232370 A232371 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Nov 23 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 27 18:22 EST 2020. Contains 338683 sequences. (Running on oeis4.)