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, 0), (0, 0, -1), (1, -1, -1), (1, 1, 1)}.
A149583
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, 0), (0, 0, -1), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =53a(5) =213a(6) =835a(7) =3295a(8) =13767a(9) =57685a(10) =241077a(11) =1029629a(12) =4454725a(13) =19208365a(14) =83540529a(15) =367533441a(16) =1617265003a(17) =7134065021a(18) =31725845327a(19) =141483149299a(20) =631238921461
External references
- oeis: A149583