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, 0), (1, 1, -1)}.
A150136
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, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =72a(5) =278a(6) =1115a(7) =4621a(8) =19636a(9) =84959a(10) =373712a(11) =1664116a(12) =7493105a(13) =34046132a(14) =155922456a(15) =718990578a(16) =3335141541a(17) =15552372406a(18) =72859635607a(19) =342751911710
External references
- oeis: A150136