T(n,k)=Number of nXk 0..4 arrays with entries increasing mod 5 by 0, 1 or 2 rightwards and downwards, starting with upper left zero.

A222169

T(n,k)=Number of nXk 0..4 arrays with entries increasing mod 5 by 0, 1 or 2 rightwards and downwards, starting with upper left zero.

Terms

    a(0) =1a(1) =3a(2) =3a(3) =9a(4) =19a(5) =9a(6) =27a(7) =121a(8) =121a(9) =27a(10) =81a(11) =771a(12) =1665a(13) =771a(14) =81a(15) =243a(16) =4913a(17) =22979a(18) =22979a(19) =4913a(20) =243a(21) =729a(22) =31307a(23) =317259a(24) =690437a(25) =317259a(26) =31307a(27) =729a(28) =2187a(29) =199497

External references