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, 0, -1), (1, -1, -1), (1, 1, 1)}.
A149586
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, 0, -1), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =55a(5) =215a(6) =875a(7) =3533a(8) =14769a(9) =63025a(10) =271061a(11) =1171573a(12) =5125689a(13) =22634577a(14) =100374805a(15) =446869675a(16) =2001901659a(17) =9014772611a(18) =40708594111a(19) =184335519819a(20) =837884736507
External references
- oeis: A149586