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, 1, 0), (1, 0, 1), (1, 1, -1)}.
A148845
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, 1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =85a(6) =315a(7) =1055a(8) =4012a(9) =13985a(10) =54082a(11) =193919a(12) =757327a(13) =2767218a(14) =10875615a(15) =40282189a(16) =159004452a(17) =594976144a(18) =2355738462a(19) =8884815803a(20) =35256788279a(21) =133810866365a(22) =531868815609
External references
- oeis: A148845