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, 0), (-1, 1, 1), (0, 1, -1), (1, 0, 1)}.
A149338
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, 0), (-1, 1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =40a(5) =149a(6) =560a(7) =2135a(8) =8355a(9) =33259a(10) =133255a(11) =538825a(12) =2200026a(13) =9034022a(14) =37274431a(15) =154600734a(16) =644062873a(17) =2692163743a(18) =11289636850a(19) =47490421438a(20) =200293595870a(21) =846706012593
External references
- oeis: A149338