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, 0, 1), (1, 1, -1)}.
A150423
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, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =24a(4) =96a(5) =390a(6) =1640a(7) =7003a(8) =30629a(9) =135960a(10) =610766a(11) =2762496a(12) =12597678a(13) =57882821a(14) =267706394a(15) =1243964373a(16) =5803343475a(17) =27181577787a(18) =127811261317a(19) =602994481450
External references
- oeis: A150423