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), (-1, 0, 1), (0, 0, -1), (0, 1, 1), (1, 0, 1)}.
A150480
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), (-1, 0, 1), (0, 0, -1), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =25a(4) =100a(5) =398a(6) =1662a(7) =6976a(8) =29977a(9) =129475a(10) =566816a(11) =2493202a(12) =11062201a(13) =49284182a(14) =220890452a(15) =993482996a(16) =4488000583a(17) =20334399427a(18) =92443775146a(19) =421325198097
External references
- oeis: A150480