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), (0, 0, 1), (1, 1, -1)}.
A148354
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), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =45a(6) =141a(7) =463a(8) =1563a(9) =5364a(10) =18737a(11) =66410a(12) =238088a(13) =861872a(14) =3145644a(15) =11564752a(16) =42791022a(17) =159184950a(18) =595039609a(19) =2234155149a(20) =8420557767a(21) =31846117947a(22) =120823458983a(23) =459696946312
External references
- oeis: A148354