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, 1, 0), (0, 1, -1), (1, 0, 1)}.
A148771
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, 1, 0), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =22a(5) =74a(6) =233a(7) =742a(8) =2600a(9) =8757a(10) =29483a(11) =105376a(12) =367158a(13) =1274598a(14) =4608221a(15) =16375729a(16) =57962319a(17) =211204408a(18) =760061396a(19) =2725968135a(20) =9991147348a(21) =36270853154a(22) =131314876548a(23) =483493516444
External references
- oeis: A148771