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), (0, 1, 1), (1, 0, 1)}.
A150538
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), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =103a(5) =422a(6) =1786a(7) =7645a(8) =33271a(9) =146306a(10) =648140a(11) =2893384a(12) =12988212a(13) =58575492a(14) =265345857a(15) =1206196837a(16) =5500661829a(17) =25157087237a(18) =115338984259a(19) =530013502114
External references
- oeis: A150538