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, 1), (1, 0, 1), (1, 1, -1)}.
A148803
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, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =83a(6) =281a(7) =971a(8) =3417a(9) =12264a(10) =44438a(11) =162904a(12) =602266a(13) =2241764a(14) =8400548a(15) =31634918a(16) =119702435a(17) =454780012a(18) =1733848968a(19) =6631814922a(20) =25436402695a(21) =97810174385a(22) =376967520192
External references
- oeis: A148803