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, 1), (1, 0, -1), (1, 1, 1)}.
A149566
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, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =59a(5) =197a(6) =921a(7) =3331a(8) =15865a(9) =60727a(10) =290761a(11) =1154769a(12) =5566691a(13) =22646317a(14) =109734289a(15) =454966047a(16) =2212275089a(17) =9308019727a(18) =45397584033a(19) =193256139843a(20) =944805547085
External references
- oeis: A149566