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, 0, 0), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
A149403
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, 0, 0), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =52a(5) =170a(6) =792a(7) =2958a(8) =14057a(9) =54619a(10) =264029a(11) =1068087a(12) =5208579a(13) =21555125a(14) =105790375a(15) =446084237a(16) =2198685109a(17) =9399635429a(18) =46473502878a(19) =200903485754a(20) =995565199085
External references
- oeis: A149403