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), (1, 1, 0)}.
A151246
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), (1, 1, 0)}.
Terms
- a(0) =1a(1) =4a(2) =16a(3) =72a(4) =336a(5) =1580a(6) =7574a(7) =36598a(8) =177752a(9) =868704a(10) =4258402a(11) =20936128a(12) =103202090a(13) =509559842a(14) =2520187796a(15) =12481010184a(16) =61875264382a(17) =307056555384
External references
- oeis: A151246