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, 1, 1), (1, 0, 0), (1, 1, -1)}.
A150019
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, 1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =18a(4) =66a(5) =250a(6) =998a(7) =4010a(8) =16537a(9) =69342a(10) =293458a(11) =1257093a(12) =5424876a(13) =23588068a(14) =103233879a(15) =454308177a(16) =2009507717a(17) =8926272795a(18) =39812543051a(19) =178190481133a(20) =800159369179
External references
- oeis: A150019