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, 0), (0, -1, 0), (0, 1, -1), (0, 1, 1), (1, 1, -1)}.
A149345
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, 0), (0, -1, 0), (0, 1, -1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =42a(5) =149a(6) =563a(7) =2167a(8) =8521a(9) =34010a(10) =137899a(11) =566278a(12) =2347387a(13) =9815176a(14) =41356830a(15) =175507147a(16) =749312195a(17) =3216195084a(18) =13872335903a(19) =60105398885a(20) =261496852724
External references
- oeis: A149345