Number of nX3 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,3,0,2,2 for x=0,1,2,3,4.
A197452
Number of nX3 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,3,0,2,2 for x=0,1,2,3,4.
Terms
- a(0) =2a(1) =10a(2) =31a(3) =84a(4) =290a(5) =923a(6) =2887a(7) =9216a(8) =29288a(9) =92868a(10) =294893a(11) =936361a(12) =2972409a(13) =9436595a(14) =29959267a(15) =95112260a(16) =301956214a(17) =958634094a(18) =3043413512a(19) =9662045566a(20) =30674490204a(21) =97383543481a(22) =309167462063a(23) =981526438497
External references
- oeis: A197452