a(n) = sum of numbers which in base 2 contain exactly n digits 1 and not more than n digits 0.
A131568
a(n) = sum of numbers which in base 2 contain exactly n digits 1 and not more than n digits 0.
Terms
- a(0) =0a(1) =3a(2) =45a(3) =630a(4) =8925a(5) =128898a(6) =1891890a(7) =28113228a(8) =421717725a(9) =6372696330a(10) =96865261350
External references
- oeis: A131568