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), (0, 1, -1), (1, 0, -1), (1, 1, -1), (1, 1, 1)}.
A149642
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), (0, 1, -1), (1, 0, -1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =71a(5) =239a(6) =1163a(7) =4345a(8) =21417a(9) =83977a(10) =416265a(11) =1686337a(12) =8383997a(13) =34790589a(14) =173269929a(15) =731926875a(16) =3649321671a(17) =15627492163a(18) =77977391863a(19) =337568268171
External references
- oeis: A149642