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, 1, 1), (1, 0, -1), (1, 1, 1)}.
A149264
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, 1, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =40a(5) =128a(6) =490a(7) =1647a(8) =6460a(9) =22668a(10) =88980a(11) =320904a(12) =1267096a(13) =4635894a(14) =18391702a(15) =68175937a(16) =270692796a(17) =1013765698a(18) =4032287792a(19) =15203817018a(20) =60568746766a(21) =229786861594a(22) =915830459954
External references
- oeis: A149264