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, 0), (-1, 0, 0), (0, 0, 1), (1, 0, 1), (1, 1, -1)}.
A150540
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, 0), (-1, 0, 0), (0, 0, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =103a(5) =427a(6) =1831a(7) =8019a(8) =35703a(9) =161260a(10) =736399a(11) =3391747a(12) =15739863a(13) =73517590a(14) =345214013a(15) =1628487358a(16) =7713911678a(17) =36670988713a(18) =174874568893a(19) =836288878658
External references
- oeis: A150540