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, 1, -1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
A149142
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, 1, -1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =36a(5) =113a(6) =424a(7) =1544a(8) =5871a(9) =22415a(10) =87804a(11) =344677a(12) =1373408a(13) =5509321a(14) =22259539a(15) =90499632a(16) =370185075a(17) =1520688616a(18) =6276288872a(19) =26008946672a(20) =108143110352a(21) =451143280947
External references
- oeis: A149142