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), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
A150105
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), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =19a(4) =69a(5) =239a(6) =888a(7) =3283a(8) =12323a(9) =46434a(10) =177690a(11) =675990a(12) =2602449a(13) =10024005a(14) =38728070a(15) =149933270a(16) =582864650a(17) =2263804898a(18) =8824622593a(19) =34428415653a(20) =134461239120a(21) =525789194496
External references
- oeis: A150105