Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (-1, 1, 1), (1, 0, -1), (1, 0, 1), (1, 1, -1)}.
A149756
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (-1, 1, 1), (1, 0, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =85a(5) =329a(6) =1645a(7) =6913a(8) =34565a(9) =152729a(10) =763645a(11) =3482097a(12) =17410485a(13) =81061001a(14) =405305005a(15) =1914744673a(16) =9573723365a(17) =45711939705a(18) =228559698525
External references
- oeis: A149756