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, 1, 1), (1, 0, -1), (1, 1, 1)}.
A149647
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, 1, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =71a(5) =247a(6) =1201a(7) =4519a(8) =22269a(9) =87991a(10) =435723a(11) =1777551a(12) =8828245a(13) =36823267a(14) =183269901a(15) =777183633a(16) =3873252695a(17) =16638290989a(18) =82992609063a(19) =360202691905
External references
- oeis: A149647