a(n) = n 5's sandwiched between two 1's.
A205085
a(n) = n 5's sandwiched between two 1's.
Terms
- a(0) =11a(1) =151a(2) =1551a(3) =15551a(4) =155551a(5) =1555551a(6) =15555551a(7) =155555551a(8) =1555555551a(9) =15555555551a(10) =155555555551
External references
- oeis: A205085