This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A275037 #4 Jul 14 2016 09:53:53 %S A275037 1,1,2,2,6,3,4,16,18,6,8,48,46,54,12,16,144,137,146,162,24,32,432,401, %T A275037 570,450,486,48,64,1296,1152,2185,2334,1428,1458,96,128,3888,3336, %U A275037 8273,11624,9774,4463,4374,192,256,11664,9720,31495,57984,64045,40572,14086 %N A275037 T(n,k)=Number of nXk 0..2 arrays with no element equal to any value at offset (0,-1) (-1,-2) or (-2,0) and new values introduced in order 0..2. %C A275037 Table starts %C A275037 ...1.....1......2.......4........8.........16..........32...........64 %C A275037 ...2.....6.....16......48......144........432........1296.........3888 %C A275037 ...3....18.....46.....137......401.......1152........3336.........9720 %C A275037 ...6....54....146.....570.....2185.......8273.......31495.......120845 %C A275037 ..12...162....450....2334....11624......57984......290927......1465435 %C A275037 ..24...486...1428....9774....64045.....421793.....2788663.....18527905 %C A275037 ..48..1458...4463...40572...351197....3056856....26631796....233894638 %C A275037 ..96..4374..14086..169348..1931619...22207559...255796423...2976710318 %C A275037 .192.13122..44195..704704.10581148..160767947..2451632155..37779884891 %C A275037 .384.39366.139130.2937764.58059378.1166126087.23548292980.480461388679 %H A275037 R. H. Hardin, <a href="/A275037/b275037.txt">Table of n, a(n) for n = 1..338</a> %F A275037 Empirical for column k: %F A275037 k=1: a(n) = 2*a(n-1) for n>3 %F A275037 k=2: a(n) = 3*a(n-1) for n>2 %F A275037 k=3: [order 16] for n>17 %F A275037 k=4: [order 35] for n>37 %F A275037 k=5: [order 70] for n>74 %F A275037 Empirical for row n: %F A275037 n=1: a(n) = 2*a(n-1) for n>2 %F A275037 n=2: a(n) = 3*a(n-1) for n>3 %F A275037 n=3: [order 9] for n>10 %F A275037 n=4: [order 17] for n>19 %F A275037 n=5: [order 28] for n>32 %F A275037 n=6: [order 67] for n>72 %e A275037 Some solutions for n=4 k=4 %e A275037 ..0..1..2..1. .0..1..2..1. .0..1..0..1. .0..1..0..2. .0..1..0..2 %e A275037 ..1..0..1..2. .2..0..1..0. .2..0..2..0. .0..1..2..0. .0..2..1..0 %e A275037 ..1..2..0..2. .1..0..1..2. .2..0..1..2. .1..2..1..0. .1..0..2..0 %e A275037 ..0..1..2..0. .1..2..0..1. .1..2..1..2. .1..2..0..1. .2..0..2..1 %Y A275037 Column 1 is A003945(n-2). %Y A275037 Column 2 is A008776(n-1). %Y A275037 Row 1 is A000079(n-2). %K A275037 nonn,tabl %O A275037 1,3 %A A275037 _R. H. Hardin_, Jul 14 2016