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, -1, 1), (0, 1, 1), (1, 1, -1)}.
A149009
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, -1, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =34a(5) =125a(6) =493a(7) =1985a(8) =8179a(9) =34294a(10) =145882a(11) =627271a(12) =2724884a(13) =11930004a(14) =52598972a(15) =233319144a(16) =1040382810a(17) =4660715618a(18) =20965553331a(19) =94656365505a(20) =428777469368
External references
- oeis: A149009