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, 1, -1), (0, 1, 0), (1, 0, 0)}.
A149840
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, 1, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =36a(5) =105a(6) =359a(7) =1234a(8) =4179a(9) =15184a(10) =55991a(11) =204578a(12) =771394a(13) =2964054a(14) =11327531a(15) =43884270a(16) =172977384a(17) =680790080a(18) =2693644347a(19) =10800095655a(20) =43381674853a(21) =174545003823a(22) =708672027933
External references
- oeis: A149840