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, 0), (-1, 0, 1), (-1, 1, -1), (1, 0, 0)}.
A148005
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, 0), (-1, 0, 1), (-1, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =15a(6) =44a(7) =91a(8) =286a(9) =633a(10) =2072a(11) =4796a(12) =16180a(13) =38727a(14) =133548a(15) =327895a(16) =1150226a(17) =2881857a(18) =10247072a(19) =26099008a(20) =93830568a(21) =242264113a(22) =878987980a(23) =2295723288a(24) =8393889812a(25) =22139557300a(26) =81484257064a(27) =216757035756a(28) =802324361696
External references
- oeis: A148005