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, -1), (-1, -1, 0), (0, 0, -1), (0, 1, 0), (1, 0, 1)}.
A150000
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, -1), (-1, -1, 0), (0, 0, -1), (0, 1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =60a(5) =211a(6) =788a(7) =3087a(8) =12031a(9) =47612a(10) =193723a(11) =793555a(12) =3259183a(13) =13568871a(14) =57057573a(15) =240409463a(16) =1018554059a(17) =4350518045a(18) =18652248413a(19) =80161322115a(20) =346233726610
External references
- oeis: A150000