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, 1), (-1, 0, 1), (-1, 1, 1), (1, 0, -1), (1, 1, 0)}.
A149226
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, 1), (-1, 0, 1), (-1, 1, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =45a(5) =137a(6) =651a(7) =2225a(8) =10782a(9) =39551a(10) =193668a(11) =744173a(12) =3667892a(13) =14564363a(14) =72089043a(15) =293344604a(16) =1456043669a(17) =6038218547a(18) =30028994375a(19) =126420217768a(20) =629561111620
External references
- oeis: A149226