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, 0), (-1, 0, 1), (0, 1, 1), (1, -1, 0), (1, 0, -1)}.
A149030
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, 0), (-1, 0, 1), (0, 1, 1), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =33a(5) =124a(6) =478a(7) =1876a(8) =7653a(9) =31520a(10) =131923a(11) =560361a(12) =2397177a(13) =10362660a(14) =45122797a(15) =197619125a(16) =871134632a(17) =3857758844a(18) =17160398867a(19) =76658932408a(20) =343609269081
External references
- oeis: A149030