Number of 2Xn arrays containing n copies of 0..2-1 with every element equal to at least one horizontal or antidiagonal neighbor and the top left element equal to 0.
A267618
Number of 2Xn arrays containing n copies of 0..2-1 with every element equal to at least one horizontal or antidiagonal neighbor and the top left element equal to 0.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =4a(4) =12a(5) =34a(6) =112a(7) =340a(8) =1073a(9) =3335a(10) =10487a(11) =32890a(12) =103628a(13) =326677a(14) =1032139a(15) =3264645a(16) =10341541a(17) =32795480a(18) =104121342a(19) =330894709a(20) =1052560143a(21) =3350969989a(22) =10676723143a(23) =34042525681a(24) =108617828200a(25) =346780908546
External references
- oeis: A267618