First, second, third... differences

[Eric Angelini]

10   11   13   17    27    51    109   250 ...
   1    2    4    10    24    58    141
      1    2    6    14    34     83
        1    4     8    20    49
           3    4    12    29
             1     8    17
                7     9
                   2
                      7 ...
 
Concatenate the digits of the main diagonal and
you'll get the concatenation of the sequence's digits.
 
A flavour of:
http://www.research.att.com/~njas/sequences/A000110 <http://www.research.att.com/~njas/sequences/A000110> 
 
Best,
E.
 
                     
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