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, 0, 0), (0, -1, 1), (0, 1, 1), (1, -1, 0), (1, 0, -1)}.
A149440
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, 0, 0), (0, -1, 1), (0, 1, 1), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =47a(5) =178a(6) =717a(7) =2931a(8) =12206a(9) =51725a(10) =222382a(11) =965695a(12) =4229004a(13) =18663791a(14) =82908381a(15) =370362024a(16) =1662456328a(17) =7494619832a(18) =33916523818a(19) =154011480462a(20) =701493894387
External references
- oeis: A149440