T(n,k)=Number of nXk 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically or antidiagonally, and top left element zero.
A232948
T(n,k)=Number of nXk 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically or antidiagonally, and top left element zero.
Terms
- a(0) =1a(1) =3a(2) =3a(3) =9a(4) =17a(5) =9a(6) =27a(7) =99a(8) =99a(9) =27a(10) =81a(11) =577a(12) =1163a(13) =577a(14) =81a(15) =243a(16) =3363a(17) =13707a(18) =13707a(19) =3363a(20) =243a(21) =729a(22) =19601a(23) =161621a(24) =328989a(25) =161621a(26) =19601a(27) =729a(28) =2187a(29) =114243
External references
- oeis: A232948