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, 1, -1), (0, 1, 0), (1, 0, -1), (1, 0, 0)}.
A149834
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, 1, -1), (0, 1, 0), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =30a(5) =94a(6) =316a(7) =1112a(8) =3976a(9) =14798a(10) =56508a(11) =217444a(12) =856594a(13) =3430942a(14) =13813620a(15) =56463442a(16) =233440548a(17) =968955348a(18) =4064389254a(19) =17189382700a(20) =72928723582a(21) =311804852012
External references
- oeis: A149834