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, -1), (-1, 1, 0), (1, -1, 0), (1, 1, 1)}.
A149571
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, -1), (-1, 1, 0), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =63a(5) =203a(6) =999a(7) =3587a(8) =17691a(9) =67419a(10) =333565a(11) =1322809a(12) =6556223a(13) =26731127a(14) =132674229a(15) =552239801a(16) =2743793869a(17) =11604068827a(18) =57702655875a(19) =247148185971
External references
- oeis: A149571