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, 0, 1), (1, 0, 1), (1, 1, -1), (1, 1, 1)}.
A150978
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, 0, 1), (1, 0, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =36a(4) =170a(5) =755a(6) =3655a(7) =17000a(8) =83337a(9) =396500a(10) =1956819a(11) =9435684a(12) =46754691a(13) =227410198a(14) =1129692711a(15) =5527369388a(16) =27504033419a(17) =135144916877a(18) =673254945499
External references
- oeis: A150978