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), (0, 1, -1), (1, 0, 0), (1, 1, -1)}.
A148330
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), (0, 1, -1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =42a(6) =134a(7) =450a(8) =1561a(9) =5584a(10) =20384a(11) =76110a(12) =288678a(13) =1111867a(14) =4332969a(15) =17081566a(16) =68003151a(17) =273141366a(18) =1105621792a(19) =4507122693a(20) =18493763341a(21) =76333387299a(22) =316764690900
External references
- oeis: A148330