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, 1)}.
A148671
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, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =62a(6) =201a(7) =605a(8) =2101a(9) =6624a(10) =23279a(11) =76574a(12) =271210a(13) =918146a(14) =3282137a(15) =11238893a(16) =40673789a(17) =141042188a(18) =513109423a(19) =1799944820a(20) =6574646252a(21) =23298560696a(22) =85395592241a(23) =304350318826
External references
- oeis: A148671