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, 0, 0), (-1, 1, -1), (1, -1, -1), (1, 1, 1)}.
A149519
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, 0, 0), (-1, 1, -1), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =49a(5) =157a(6) =681a(7) =2371a(8) =10745a(9) =39323a(10) =179183a(11) =689829a(12) =3166221a(13) =12438603a(14) =57683523a(15) =231728067a(16) =1077569125a(17) =4402483823a(18) =20583007623a(19) =85034398167a(20) =398951873741
External references
- oeis: A149519