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, 1, -1), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
A148905
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, 1, -1), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =32a(5) =105a(6) =425a(7) =1555a(8) =6559a(9) =25671a(10) =110019a(11) =449431a(12) =1958255a(13) =8227895a(14) =36275689a(15) =155511325a(16) =692565424a(17) =3013775389a(18) =13531258452a(19) =59576885327a(20) =269293212642
External references
- oeis: A148905