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), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
A148466
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), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =19a(5) =61a(6) =221a(7) =815a(8) =3095a(9) =12109a(10) =48260a(11) =195368a(12) =803053a(13) =3337237a(14) =14015560a(15) =59384502a(16) =253544419a(17) =1090093997a(18) =4715233418a(19) =20507407116a(20) =89633056681a(21) =393499148239
External references
- oeis: A148466