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, 0, 0), (-1, 1, 1), (0, 1, 1), (1, 0, -1)}.
A148449
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, 0, 0), (-1, 1, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =17a(5) =50a(6) =171a(7) =569a(8) =1990a(9) =7154a(10) =25959a(11) =96603a(12) =363241a(13) =1381671a(14) =5322075a(15) =20650133a(16) =80879351a(17) =318931686a(18) =1265735372a(19) =5054541248a(20) =20286564666a(21) =81831126986a(22) =331530026432
External references
- oeis: A148449