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), (-1, 1, 0), (0, 0, -1), (1, 0, 1)}.
A148678
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), (-1, 1, 0), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =73a(6) =229a(7) =761a(8) =2671a(9) =9387a(10) =34743a(11) =127299a(12) =462043a(13) =1736519a(14) =6577091a(15) =25138527a(16) =96964869a(17) =371447721a(18) =1437904717a(19) =5632450065a(20) =22114602041a(21) =87321019245a(22) =344916017793
External references
- oeis: A148678