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, 1), (-1, 1, -1), (0, 1, 1), (1, 0, 0)}.
A149991
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, 1), (-1, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =57a(5) =207a(6) =770a(7) =2928a(8) =11385a(9) =44761a(10) =178507a(11) =717723a(12) =2911567a(13) =11889471a(14) =48843018a(15) =201708227a(16) =836728300a(17) =3485203920a(18) =14568180657a(19) =61093715901a(20) =256943318442
External references
- oeis: A149991