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, -1, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 1)}.
A148787
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, -1, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =24a(5) =82a(6) =283a(7) =960a(8) =3672a(9) =13259a(10) =50113a(11) =193764a(12) =742612a(13) =2912785a(14) =11522720a(15) =45500097a(16) =183104544a(17) =735219575a(18) =2970271252a(19) =12116306433a(20) =49363789064a(21) =202394438728a(22) =833999867026
External references
- oeis: A148787