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, 1, -1), (1, -1, 0), (1, 0, 0), (1, 1, 0)}.
A150064
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, 1, -1), (1, -1, 0), (1, 0, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =63a(5) =226a(6) =870a(7) =3365a(8) =13697a(9) =55917a(10) =235493a(11) =991616a(12) =4287439a(13) =18531073a(14) =81564725a(15) =358571572a(16) =1602215627a(17) =7152092988a(18) =32311542880a(19) =145790688544a(20) =665088946686
External references
- oeis: A150064