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, -1), (0, 1, 1), (1, 0, 0)}.
A149843
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, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =36a(5) =110a(6) =362a(7) =1212a(8) =4082a(9) =13948a(10) =48522a(11) =169384a(12) =594950a(13) =2109232a(14) =7512468a(15) =26841982a(16) =96379292a(17) =347465634a(18) =1255631188a(19) =4550488168a(20) =16539909198a(21) =60243693028a(22) =219843780960a(23) =803942546000
External references
- oeis: A149843