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A127851
a(n) has n 1's followed by C(n-1,2) 0's.
1
0, 1, 11, 1110, 1111000, 11111000000, 1111110000000000, 1111111000000000000000, 11111111000000000000000000000, 1111111110000000000000000000000000000
OFFSET
0,3
COMMENTS
Base 2 version of A127850.
FORMULA
a(n)=10^C(n,2)*(10^n-1)/(9*10^(n-1))
CROSSREFS
Sequence in context: A280042 A287044 A191111 * A135656 A130602 A362919
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Feb 02 2007
STATUS
approved