Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,1,1 for x=0,1,2,3,4.

A197540

Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,1,1 for x=0,1,2,3,4.

Terms

    a(0) =2a(1) =8a(2) =11a(3) =24a(4) =61a(5) =121a(6) =270a(7) =614a(8) =1296a(9) =2973a(10) =6574a(11) =14527a(12) =32621a(13) =72032a(14) =160402a(15) =357304a(16) =792903a(17) =1765982a(18) =3926185a(19) =8727963a(20) =19420018a(21) =43174998a(22) =96024756a(23) =213571465a(24) =474912978a(25) =1056243677a(26) =2348975193a(27) =5223841988a(28) =11617743070a(29) =25836617638

External references