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)}.
A150071
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)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =64a(5) =220a(6) =792a(7) =2844a(8) =10508a(9) =38726a(10) =144976a(11) =542780a(12) =2051752a(13) =7761764a(14) =29554000a(15) =112658878a(16) =431389136a(17) =1653790724a(18) =6360803312a(19) =24493717106a(20) =94551791464a(21) =365396555846
External references
- oeis: A150071