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, 1, 0), (0, 0, -1), (0, 1, 0), (1, 0, 0)}.
A149935
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, 1, 0), (0, 0, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =49a(5) =166a(6) =588a(7) =2169a(8) =8212a(9) =31674a(10) =124481a(11) =497383a(12) =2012856a(13) =8232712a(14) =34009888a(15) =141759808a(16) =595396476a(17) =2517482962a(18) =10710474504a(19) =45824776126a(20) =197053037341a(21) =851230745743
External references
- oeis: A149935