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, 1, 0), (0, 1, 1), (1, 0, -1)}.
A149953
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, 1, 0), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =51a(5) =183a(6) =690a(7) =2680a(8) =10664a(9) =43361a(10) =179166a(11) =750618a(12) =3182815a(13) =13627850a(14) =58858838a(15) =256136007a(16) =1121888880a(17) =4942820194a(18) =21890082385a(19) =97392793659a(20) =435140490144
External references
- oeis: A149953