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, 0), (0, 1, 0), (1, 0, 0), (1, 1, -1)}.
A149924
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, 0), (0, 1, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =47a(5) =161a(6) =580a(7) =2167a(8) =8409a(9) =33338a(10) =135326a(11) =558608a(12) =2341146a(13) =9943026a(14) =42693924a(15) =185206211a(16) =810338935a(17) =3573667942a(18) =15869799860a(19) =70918166895a(20) =318720501038
External references
- oeis: A149924