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, 1, -1), (1, 0, 0)}.
A148071
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, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =21a(6) =51a(7) =143a(8) =374a(9) =1071a(10) =3095a(11) =8934a(12) =26170a(13) =77812a(14) =239576a(15) =719583a(16) =2245728a(17) =7027771a(18) =21874554a(19) =68780246a(20) =217957471a(21) =699596665a(22) =2221050242a(23) =7204830752a(24) =23364983444a(25) =75490995551a(26) =245743450650a(27) =803146080439
External references
- oeis: A148071