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, 0, -1), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149633
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, 0, -1), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =69a(5) =221a(6) =1077a(7) =3991a(8) =19405a(9) =74335a(10) =365031a(11) =1463529a(12) =7211393a(13) =29565759a(14) =146138723a(15) =611213435a(16) =3027868001a(17) =12852758527a(18) =63774054463a(19) =273911104023
External references
- oeis: A149633