Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,0,2,2 for x=0,1,2,3,4.
A197556
Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,0,2,2 for x=0,1,2,3,4.
Terms
- a(0) =2a(1) =10a(2) =35a(3) =106a(4) =410a(5) =1479a(6) =5280a(7) =18882a(8) =67751a(9) =242440a(10) =867925a(11) =3107159a(12) =11124592a(13) =39826674a(14) =142586969a(15) =510485048a(16) =1827627898a(17) =6543219347a(18) =23425871440a(19) =83868676944a(20) =300264436266
External references
- oeis: A197556