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), (0, 0, -1), (0, 0, 1), (0, 1, 1), (1, 1, 1)}.
A151212
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), (0, 0, -1), (0, 0, 1), (0, 1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =55a(4) =249a(5) =1135a(6) =5275a(7) =24727a(8) =116855a(9) =555601a(10) =2654321a(11) =12732069a(12) =61274953a(13) =295727069a(14) =1430727417a(15) =6936363189a(16) =33690805225a(17) =163906989103a(18) =798574185487
External references
- oeis: A151212