T(n,k) = 1/16 the number of (n+1) X (k+1) 0..7 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease, and at least two adjacent blocks having the same increasing direction.

A183738

T(n,k) = 1/16 the number of (n+1) X (k+1) 0..7 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease, and at least two adjacent blocks having the same increasing direction.

Terms

    a(0) =0a(1) =21a(2) =21a(3) =563a(4) =290a(5) =563a(6) =9403a(7) =13169a(8) =13169a(9) =9403a(10) =135578a(11) =550268a(12) =469254a(13) =550268a(14) =135578a(15) =1814815a(16) =19849923a(17) =32555965a(18) =32555965a(19) =19849923a(20) =1814815a(21) =23204876a(22) =667017027a(23) =2610816897a(24) =3202350892a(25) =2610816897a(26) =667017027a(27) =23204876a(28) =287769879

External references