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, 0, 0), (0, -1, 1), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
A150134
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, 0, 0), (0, -1, 1), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =72a(5) =275a(6) =1093a(7) =4479a(8) =18801a(9) =80451a(10) =349700a(11) =1540012a(12) =6856998a(13) =30819381a(14) =139647086a(15) =637238709a(16) =2925903993a(17) =13508063971a(18) =62666934328a(19) =291993695249
External references
- oeis: A150134