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, 1)}.
A151221
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, 1)}.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =56a(4) =261a(5) =1217a(6) =5840a(7) =28054a(8) =136500a(9) =665095a(10) =3262019a(11) =16019624a(12) =78964457a(13) =389662206a(14) =1927208588a(15) =9540241539a(16) =47296361760a(17) =234644582104
External references
- oeis: A151221