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, 1), (0, 0, -1), (0, 1, 1), (1, -1, 0)}.
A148800
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, 1), (0, 0, -1), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =25a(5) =86a(6) =294a(7) =1040a(8) =3833a(9) =14386a(10) =54712a(11) =210824a(12) =822979a(13) =3247027a(14) =12924638a(15) =51841966a(16) =209371068a(17) =851006530a(18) =3478406410a(19) =14290345910a(20) =58982156747a(21) =244473647740
External references
- oeis: A148800