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, 1, -1), (0, 0, -1), (0, 1, 0), (1, 0, 1)}.
A150161
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, 1, -1), (0, 0, -1), (0, 1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =75a(5) =284a(6) =1121a(7) =4518a(8) =18673a(9) =77951a(10) =329625a(11) =1407327a(12) =6067266a(13) =26331095a(14) =114979744a(15) =504825030a(16) =2227872177a(17) =9874329662a(18) =43929749568a(19) =196113975301a(20) =878332854815
External references
- oeis: A150161