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), (-1, 0, 1), (1, 0, 1), (1, 1, -1)}.
A149404
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), (-1, 0, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =52a(5) =177a(6) =807a(7) =3041a(8) =14268a(9) =56590a(10) =270028a(11) =1106952a(12) =5339922a(13) =22402560a(14) =108879743a(15) =464602037a(16) =2270119906a(17) =9813344344a(18) =48139440999a(19) =210239624137
External references
- oeis: A149404