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, 1), (0, 1, -1), (1, 0, 1)}.
A148953
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, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =103a(6) =384a(7) =1442a(8) =5630a(9) =22140a(10) =89391a(11) =362567a(12) =1496206a(13) =6200980a(14) =26010002a(15) =109530531a(16) =465203693a(17) =1983050889a(18) =8507197775a(19) =36615589619a(20) =158370065466a(21) =686997801100
External references
- oeis: A148953