T(n,k)=Number of nXk 0..6 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

A203066

T(n,k)=Number of nXk 0..6 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

Terms

    a(0) =1a(1) =7a(2) =7a(3) =49a(4) =455a(5) =49a(6) =252a(7) =16625a(8) =16625a(9) =252a(10) =1127a(11) =491953a(12) =3421817a(13) =491953a(14) =1127a(15) =4977a(16) =14623955a(17) =608893191a(18) =608893191a(19) =14623955a(20) =4977a(21) =22736a(22) =449303011a(23) =111898706731a(24) =647485600638a(25) =111898706731a(26) =449303011a(27) =22736a(28) =105813

External references