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), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.
A148326
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), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =42a(6) =127a(7) =406a(8) =1384a(9) =4674a(10) =16231a(11) =57908a(12) =207172a(13) =759480a(14) =2799649a(15) =10388278a(16) =39267427a(17) =148491557a(18) =566578382a(19) =2183452049a(20) =8421213079a(21) =32796434160a(22) =128237720641a(23) =502717621685
External references
- oeis: A148326