T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with 2X2 edge jumps all no more than +1 in one of the clockwise or counterclockwise directions but not both.

A234769

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with 2X2 edge jumps all no more than +1 in one of the clockwise or counterclockwise directions but not both.

Terms

    a(0) =56a(1) =240a(2) =240a(3) =916a(4) =1624a(5) =916a(6) =3800a(7) =9404a(8) =9404a(9) =3800a(10) =14828a(11) =64180a(12) =71280a(13) =64180a(14) =14828a(15) =60552a(16) =398696a(17) =760072a(18) =760072a(19) =398696a(20) =60552a(21) =239044a(22) =2678704a(23) =6340684a(24) =14119456a(25) =6340684a(26) =2678704a(27) =239044a(28) =967784a(29) =17095452

External references