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

A197211

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

Terms

    a(0) =1a(1) =2a(2) =5a(3) =8a(4) =18a(5) =37a(6) =73a(7) =151a(8) =306a(9) =621a(10) =1266a(11) =2572a(12) =5231a(13) =10641a(14) =21637a(15) =44006a(16) =89497a(17) =182008a(18) =370158a(19) =752797a(20) =1530977a(21) =3113587a(22) =6332166a(23) =12877865a(24) =26190002a(25) =53263176a(26) =108322495a(27) =220297841a(28) =448024553a(29) =911157386

External references