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, 0), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
A148465
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, 0), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =19a(5) =61a(6) =216a(7) =789a(8) =2960a(9) =11439a(10) =45114a(11) =180779a(12) =735676a(13) =3030120a(14) =12613335a(15) =53004791a(16) =224550436a(17) =958227715a(18) =4115750849a(19) =17780103175a(20) =77214818728a(21) =336921319180
External references
- oeis: A148465