[seqfan] Is 0001 a 4-digit base 10 number ?

[Giovanni Resta]

My question arises from the description of A126364
( http://oeis.org/A126364 ) :

Number of base 10 n-digit numbers with adjacent digits differing by one 
or less. 		
1, 10, 28, 80, 230, 664,...

It seems clear, from a(2)=28, that the author counts 00 and 01 among
the 2-digit base 10 numbers.

It seems to me a little unusual, but I may be wrong.

What's your opinion ?

giovanni