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, 0, -1), (1, 1, 0)}.
A148581
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, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =52a(6) =180a(7) =531a(8) =1935a(9) =6087a(10) =23075a(11) =76002a(12) =294690a(13) =1007573a(14) =3967709a(15) =13952603a(16) =55705977a(17) =200096396a(18) =808097516a(19) =2954315100a(20) =12036963816a(21) =44673868259a(22) =183352067367a(23) =689141233096
External references
- oeis: A148581