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, 0, 0), (1, 1, 1)}.
A150690
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, 0, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =26a(4) =118a(5) =438a(6) =2068a(7) =8166a(8) =39240a(9) =160688a(10) =780200a(11) =3273018a(12) =15999030a(13) =68284180a(14) =335314092a(15) =1449775962a(16) =7142547625a(17) =31195747268a(18) =154066314055a(19) =678400361461
External references
- oeis: A150690