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), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
A149398
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), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =51a(5) =160a(6) =746a(7) =2774a(8) =12874a(9) =48310a(10) =232026a(11) =931403a(12) =4450558a(13) =17919901a(14) =87171832a(15) =364069868a(16) =1763643203a(17) =7374086134a(18) =36118920595a(19) =154571795570a(20) =754561620858
External references
- oeis: A149398