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), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
A148462
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), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =18a(5) =61a(6) =223a(7) =835a(8) =3296a(9) =13280a(10) =54828a(11) =230937a(12) =986261a(13) =4275360a(14) =18729877a(15) =82912159a(16) =370207793a(17) =1665674199a(18) =7546473001a(19) =34395212088a(20) =157636435318a(21) =725993948563
External references
- oeis: A148462