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, -1, 1), (0, 0, -1), (0, 1, 0), (1, 0, 0), (1, 1, 1)}.
A151156
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, -1, 1), (0, 0, -1), (0, 1, 0), (1, 0, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =47a(4) =209a(5) =953a(6) =4443a(7) =21003a(8) =100245a(9) =482177a(10) =2333301a(11) =11344331a(12) =55364953a(13) =271053197a(14) =1330476361a(15) =6544953795a(16) =32255709545a(17) =159218157939a(18) =786989575669
External references
- oeis: A151156