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), (0, 1, -1), (1, -1, -1), (1, 0, 1)}.
A148781
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), (0, 1, -1), (1, -1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =23a(5) =81a(6) =280a(7) =977a(8) =3604a(9) =13639a(10) =52495a(11) =204309a(12) =809815a(13) =3254081a(14) =13151968a(15) =53676309a(16) =221332075a(17) =919068872a(18) =3840205474a(19) =16141523490a(20) =68250278556a(21) =290038761654
External references
- oeis: A148781