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), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
A148646
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), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =23a(5) =62a(6) =262a(7) =812a(8) =3573a(9) =12012a(10) =54270a(11) =193053a(12) =888926a(13) =3295073a(14) =15374504a(15) =58782452a(16) =276979000a(17) =1085072796a(18) =5152041461a(19) =20583672366a(20) =98328543277a(21) =399250355193
External references
- oeis: A148646