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!)
 A259742 T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 or 01010101 9
 20, 22, 22, 42, 36, 42, 62, 74, 74, 62, 101, 136, 190, 136, 101, 152, 230, 374, 374, 230, 152, 265, 414, 792, 868, 792, 414, 265, 382, 760, 1514, 1882, 1882, 1514, 760, 382, 652, 1356, 3480, 4456, 4904, 4456, 3480, 1356, 652, 962, 2414, 6542, 10570, 12086, 12086 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ..20...22....42.....62....101.....152......265......382.......652........962 ..22...36....74....136....230.....414......760.....1356......2414.......4348 ..42...74...190....374....792....1514.....3480.....6542.....14580......27866 ..62..136...374....868...1882....4456....10570....24150.....55686.....130032 .101..230...792...1882...4904...12086....35036....82492....230779.....558772 .152..414..1514...4456..12086...36522...110886...321402....940024....2797222 .265..760..3480..10570..35036..110886...416107..1244504...4489732...13887332 .382.1356..6542..24150..82492..321402..1244504..4569918..17054488...64800792 .652.2414.14580..55686.230779..940024..4489732.17054488..77901650..308237826 .962.4348.27866.130032.558772.2797222.13887332.64800792.308237826.1497446190 LINKS R. H. Hardin, Table of n, a(n) for n = 1..1042 FORMULA Empirical for column k: k=1: a(n) = a(n-2) +3*a(n-4) +2*a(n-6) for n>7 k=2: a(n) = a(n-1) +2*a(n-3) +a(n-4) k=3: a(n) = 2*a(n-2) +9*a(n-4) +4*a(n-6) -6*a(n-8) +4*a(n-10) for n>11 k=4: [order 10] for n>11 k=5: [order 18] for n>19 k=6: [order 20] for n>22 k=7: [order 34] for n>37 EXAMPLE Some solutions for n=4 k=4 ..1..0..1..0..1..0....0..1..0..1..0..0....0..0..0..1..0..0....1..0..1..0..1..0 ..0..1..0..1..0..1....0..0..1..0..1..0....1..0..1..0..1..0....0..1..0..1..0..0 ..1..0..1..0..1..0....0..1..0..1..0..1....0..1..0..1..0..1....1..0..1..0..1..0 ..0..1..0..0..0..1....1..0..1..0..1..0....1..0..1..0..1..0....0..1..0..1..0..1 ..1..0..1..0..1..0....0..1..0..1..0..0....0..0..0..1..0..1....1..0..0..0..1..0 ..0..1..0..1..0..1....0..0..1..0..1..0....0..0..1..0..0..0....0..1..0..1..0..1 CROSSREFS Sequence in context: A041838 A128356 A109212 * A050653 A267510 A095453 Adjacent sequences: A259739 A259740 A259741 * A259743 A259744 A259745 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Jul 04 2015 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 9 01:07 EST 2023. Contains 367681 sequences. (Running on oeis4.)