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, 0), (-1, 0, 1), (1, 0, -1), (1, 0, 1), (1, 1, -1)}.
A149390
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, 0), (-1, 0, 1), (1, 0, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =50a(5) =180a(6) =765a(7) =3057a(8) =13305a(9) =56407a(10) =250672a(11) =1098659a(12) =4964911a(13) =22229939a(14) =101785502a(15) =462852168a(16) =2141109671a(17) =9852233226a(18) =45947914834a(19) =213392971356
External references
- oeis: A149390