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), (-1, 1, 0), (0, 0, -1), (1, 0, 1)}.
A149236
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), (-1, 1, 0), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =34a(5) =123a(6) =435a(7) =1533a(8) =5892a(9) =22237a(10) =84367a(11) =332331a(12) =1306500a(13) =5142079a(14) =20652446a(15) =83135547a(16) =334935274a(17) =1364559971a(18) =5580387419a(19) =22840235561a(20) =94098748404a(21) =389138417389
External references
- oeis: A149236