Number of potential flows in 3 X 3 array with integer velocities in -n..n, i.e., number of 3 X 3 arrays with adjacent elements differing by no more than n, counting arrays differing by a constant only once.
A068744
Number of potential flows in 3 X 3 array with integer velocities in -n..n, i.e., number of 3 X 3 arrays with adjacent elements differing by no more than n, counting arrays differing by a constant only once.
Terms
- a(0) =1a(1) =1665a(2) =87825a(3) =1253329a(4) =9230193a(5) =45642289a(6) =172989921a(7) =542131425a(8) =1473095713a(9) =3582226465a(10) =7970825457a(11) =16492629297a(12) =32119620625a(13) =59427841617a(14) =105227044417a(15) =179360179905a(16) =295700892993a(17) =473379359425a(18) =738268965841
External references
- oeis: A068744