Number of n X 2 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 3 binary array having two adjacent 1's and two adjacent 0's.
A227438
Number of n X 2 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 3 binary array having two adjacent 1's and two adjacent 0's.
Terms
- a(0) =4a(1) =16a(2) =62a(3) =240a(4) =932a(5) =3620a(6) =14056a(7) =54576a(8) =211912a(9) =822832a(10) =3194960a(11) =12405648a(12) =48169664a(13) =187037120a(14) =726243040a(15) =2819915904a(16) =10949400256a(17) =42515227456a(18) =165081604736a(19) =640992365568
External references
- oeis: A227438