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), (0, 0, -1), (0, 1, 1), (1, 0, 1)}.
A150185
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), (0, 0, -1), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =80a(5) =304a(6) =1198a(7) =4880a(8) =20196a(9) =84392a(10) =356572a(11) =1520772a(12) =6530176a(13) =28222746a(14) =122757040a(15) =536408010a(16) =2353654246a(17) =10369862958a(18) =45853776044a(19) =203408616728a(20) =904980106270
External references
- oeis: A150185