T(n,k)=Number of nXk 0..4 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

A203191

T(n,k)=Number of nXk 0..4 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

Terms

    a(0) =1a(1) =5a(2) =5a(3) =25a(4) =165a(5) =25a(6) =95a(7) =3209a(8) =3209a(9) =95a(10) =325a(11) =53233a(12) =263725a(13) =53233a(14) =325a(15) =1121a(16) =904175a(17) =19617781a(18) =19617781a(19) =904175a(20) =1121a(21) =3985a(22) =15703631a(23) =1508941377a(24) =6474088455a(25) =1508941377a(26) =15703631a(27) =3985a(28) =14288a(29) =271942421

External references