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, -1, 1), (-1, 1, 1), (1, 0, -1), (1, 1, 0)}.
A149150
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, -1, 1), (-1, 1, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =38a(5) =111a(6) =491a(7) =1619a(8) =7448a(9) =26306a(10) =123930a(11) =459055a(12) =2191280a(13) =8408836a(14) =40486937a(15) =159582815a(16) =773367694a(17) =3112854417a(18) =15160540050a(19) =62063629949a(20) =303427184699
External references
- oeis: A149150