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, 0, 0), (-1, 1, 1), (0, -1, 0), (1, 0, -1), (1, 0, 0)}.
A148735
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, 0, 0), (-1, 1, 1), (0, -1, 0), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =82a(6) =304a(7) =1137a(8) =4419a(9) =17624a(10) =71591a(11) =295945a(12) =1242057a(13) =5269407a(14) =22632264a(15) =98011100a(16) =428245235a(17) =1884755881a(18) =8349296970a(19) =37215394774a(20) =166753657393a(21) =750936303113
External references
- oeis: A148735