Number of 2Xn arrays containing n copies of 0..2-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0.
A267902
Number of 2Xn arrays containing n copies of 0..2-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0.
Terms
- a(0) =0a(1) =2a(2) =3a(3) =11a(4) =29a(5) =93a(6) =268a(7) =842a(8) =2547a(9) =7946a(10) =24539a(11) =76721a(12) =239462a(13) =751569a(14) =2360679a(15) =7437243a(16) =23461543a(17) =74155431a(18) =234687456a(19) =743792675a(20) =2359972537a(21) =7496293462a(22) =23834595755a(23) =75852059135a(24) =241594260984a(25) =770090455545
External references
- oeis: A267902