Number of nX7 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 3 and every value within 3 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.
A253003
Number of nX7 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 3 and every value within 3 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.
Terms
- a(0) =20a(1) =140a(2) =1028a(3) =7235a(4) =39758a(5) =122833a(6) =122833a(7) =4915726a(8) =59154789a(9) =329035981a(10) =1124010769a(11) =2853903059a(12) =5973571711a(13) =10950733467a(14) =18255251895a(15) =28357151187a(16) =41726455535a(17) =58833189131a(18) =80147376167a(19) =106139040835a(20) =137278207327
External references
- oeis: A253003