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, 0, 0), (0, -1, 0), (0, 0, -1), (1, 1, 1)}.
A149424
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, 0, 0), (0, -1, 0), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =40a(5) =136a(6) =496a(7) =1753a(8) =6256a(9) =22912a(10) =85216a(11) =314836a(12) =1170688a(13) =4396048a(14) =16623328a(15) =62744017a(16) =237680992a(17) =904962400a(18) =3459831424a(19) =13219219972a(20) =50621972224a(21) =194465172304a(22) =749061374848
External references
- oeis: A149424