Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,3,0,1,1 for x=0,1,2,3,4.
A197891
Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,3,0,1,1 for x=0,1,2,3,4.
Terms
- a(0) =2a(1) =12a(2) =50a(3) =180a(4) =745a(5) =3046a(6) =12531a(7) =52188a(8) =217004a(9) =902417a(10) =3754101a(11) =15614076a(12) =64942049a(13) =270106619a(14) =1123416589a(15) =4672495470a(16) =19433743246a(17) =80828359212a(18) =336179618100
External references
- oeis: A197891