T(n,k) = number of (n+1) X (k+1) 0..2 arrays with the number of clockwise edge increases in 2 X 2 subblocks nondecreasing, and counterclockwise edge increases nonincreasing, rightwards and downwards.

A206542

T(n,k) = number of (n+1) X (k+1) 0..2 arrays with the number of clockwise edge increases in 2 X 2 subblocks nondecreasing, and counterclockwise edge increases nonincreasing, rightwards and downwards.

Terms

    a(0) =81a(1) =399a(2) =399a(3) =1620a(4) =2577a(5) =1620a(6) =6462a(7) =14781a(8) =14781a(9) =6462a(10) =26481a(11) =91674a(12) =141759a(13) =91674a(14) =26481a(15) =110769a(16) =594348a(17) =1419921a(18) =1419921a(19) =594348a(20) =110769a(21) =469617a(22) =3902463a(23) =14528199a(24) =22647363a(25) =14528199a(26) =3902463a(27) =469617a(28) =2009553a(29) =25900263

External references