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, 1), (1, -1, -1), (1, 0, 1), (1, 1, -1)}.
A148906
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, 1), (1, -1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =32a(5) =105a(6) =429a(7) =1563a(8) =6673a(9) =25959a(10) =112651a(11) =457235a(12) =2015671a(13) =8422815a(14) =37516109a(15) =160145249a(16) =719358925a(17) =3120482258a(18) =14110389142a(19) =61984334190a(20) =281826273716
External references
- oeis: A148906