Number of n X 2 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or vertically, with no adjacent values equal.

A232059

Number of n X 2 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or vertically, with no adjacent values equal.

Terms

    a(0) =2a(1) =6a(2) =14a(3) =30a(4) =66a(5) =146a(6) =322a(7) =710a(8) =1566a(9) =3454a(10) =7618a(11) =16802a(12) =37058a(13) =81734a(14) =180270a(15) =397598a(16) =876930a(17) =1934130a(18) =4265858a(19) =9408646a(20) =20751422a(21) =45768702a(22) =100946050a(23) =222643522a(24) =491055746a(25) =1083057542a(26) =2388758606a(27) =5268572958a(28) =11620203458a(29) =25629165522

External references