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, 1), (-1, 1, 0), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148493
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, 1), (-1, 1, 0), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =81a(6) =330a(7) =1378a(8) =5931a(9) =26103a(10) =116949a(11) =531180a(12) =2439942a(13) =11308763a(14) =52813717a(15) =248226279a(16) =1173038179a(17) =5569350953a(18) =26549412251a(19) =127009530189a(20) =609483954875
External references
- oeis: A148493