Number of nX6 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.
A253002
Number of nX6 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) =10a(1) =55a(2) =279a(3) =1132a(4) =3072a(5) =3072a(6) =122833a(7) =1486152a(8) =8270017a(9) =27983105a(10) =70187099a(11) =145197755a(12) =263486747a(13) =435539835a(14) =671842779a(15) =982881339a(16) =1379141275a(17) =1871108347a(18) =2469268315a(19) =3184106939a(20) =4026109979a(21) =5005763195a(22) =6133552347a(23) =7419963195
External references
- oeis: A253002