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

A197345

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

Terms

    a(0) =1a(1) =9a(2) =18a(3) =83a(4) =245a(5) =914a(6) =3155a(7) =11287a(8) =39850a(9) =141325a(10) =501819a(11) =1782870a(12) =6328399a(13) =22463277a(14) =79770690a(15) =283288919a(16) =1005900951a(17) =3571642082a(18) =12682562591a(19) =45035370321a(20) =159915993486a(21) =567839908711

External references