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, 1), (0, 1, -1), (1, -1, 1), (1, 1, 0)}.
A149012
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, 1), (0, 1, -1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =34a(5) =128a(6) =500a(7) =2043a(8) =8522a(9) =36209a(10) =156692a(11) =682973a(12) =3024637a(13) =13504463a(14) =60736491a(15) =275379368a(16) =1253735435a(17) =5748912471a(18) =26479707503a(19) =122450353484a(20) =568751348854
External references
- oeis: A149012