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, 1, 1), (0, 1, 0), (1, 0, -1), (1, 0, 0)}.
A149978
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, 1, 1), (0, 1, 0), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =58a(5) =221a(6) =883a(7) =3668a(8) =15596a(9) =67571a(10) =298134a(11) =1333912a(12) =6030624a(13) =27528761a(14) =126746884a(15) =587545554a(16) =2739699560a(17) =12845256385a(18) =60510949814a(19) =286203098987
External references
- oeis: A149978