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, 0), (0, 0, -1), (1, -1, 0), (1, 1, 1)}.
A149665
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, 0), (0, 0, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =61a(5) =249a(6) =1025a(7) =4225a(8) =17981a(9) =77171a(10) =335767a(11) =1469473a(12) =6471443a(13) =28806857a(14) =128553425a(15) =576195527a(16) =2599242627a(17) =11749626791a(18) =53318577813a(19) =242787006803
External references
- oeis: A149665