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, 0), (1, -1, 1), (1, 1, 0)}.
A149191
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, 0), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =38a(5) =122a(6) =488a(7) =1710a(8) =7087a(9) =26321a(10) =111541a(11) =429981a(12) =1852992a(13) =7337801a(14) =32021180a(15) =129408800a(16) =570358802a(17) =2341953471a(18) =10405274367a(19) =43277165242a(20) =193563780133a(21) =813625097670
External references
- oeis: A149191