Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,0,1,1,1 for x=0,1,2,3,4.

A197244

Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,0,1,1,1 for x=0,1,2,3,4.

Terms

    a(0) =2a(1) =4a(2) =8a(3) =16a(4) =40a(5) =80a(6) =192a(7) =400a(8) =936a(9) =1984a(10) =4576a(11) =9824a(12) =22408a(13) =48560a(14) =109888a(15) =239728a(16) =539432a(17) =1182432a(18) =2649952a(19) =5828544a(20) =13024648a(21) =28717648a(22) =64040768a(23) =141448528a(24) =314965928a(25) =696544000a(26) =1549366240a(27) =3429474848a(28) =7622621832a(29) =16883244016

External references