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), (0, 0, 1), (0, 1, 1), (1, 1, -1)}.
A150053
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), (0, 0, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =62a(5) =210a(6) =758a(7) =2714a(8) =10054a(9) =37090a(10) =139614a(11) =524498a(12) =1995606a(13) =7587258a(14) =29089670a(15) =111524322a(16) =430033118a(17) =1658717458a(18) =6424179254a(19) =24893373562a(20) =96748946886a(21) =376241540642
External references
- oeis: A150053