T(n,k)=Rolling icosahedron footprints: number of nXk 0..11 arrays starting with 0 where 0..11 label vertices of an icosahedron and every array movement to a horizontal or vertical neighbor moves along an icosahedral edge.
A223263
T(n,k)=Rolling icosahedron footprints: number of nXk 0..11 arrays starting with 0 where 0..11 label vertices of an icosahedron and every array movement to a horizontal or vertical neighbor moves along an icosahedral edge.
Terms
- a(0) =1a(1) =5a(2) =5a(3) =25a(4) =65a(5) =25a(6) =125a(7) =845a(8) =845a(9) =125a(10) =625a(11) =10985a(12) =28885a(13) =10985a(14) =625a(15) =3125a(16) =142805a(17) =988625a(18) =988625a(19) =142805a(20) =3125a(21) =15625a(22) =1856465a(23) =33841585a(24) =89405945a(25) =33841585a(26) =1856465a(27) =15625a(28) =78125a(29) =24134045
External references
- oeis: A223263