Number of 2Xn 0..2 arrays with no more than floor(2Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.
A222987
Number of 2Xn 0..2 arrays with no more than floor(2Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.
Terms
- a(0) =2a(1) =4a(2) =7a(3) =25a(4) =86a(5) =332a(6) =1172a(7) =4566a(8) =16562a(9) =64718a(10) =238856a(11) =933970a(12) =3493494a(13) =13656426a(14) =51627746a(15) =201696470a(16) =768828322a(17) =3002421486a(18) =11518434130a(19) =44975259758a(20) =173404040458a(21) =677168068918
External references
- oeis: A222987