

A102355


Any digit "d" (except the first two) is the absolute difference between x and y > x=sum of the 2 digits standing immediately to the left of "d", y=sum of the 2 digits standing immediately to the right of "d".


0



0, 1, 2, 120, 121, 201, 2120, 12120, 121201, 212012, 12012120, 12120121, 20121201, 212012120, 1212012120, 12120121201, 21201212012, 1201212012120, 1212012120121, 2012120121201, 21201212012120, 121201212012120
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OFFSET

0,3


COMMENTS

To build such sequences, repeat one of those three patterns and insert commas accordingly: i) 0aaaa > 0aaaa0aaaa0aaaa... > 0,1,11,101,1110,11110... j) 0abab > 0abab0abab0abab... > 0,4,9,490,494,904,9490... k) 0a00a > 0a00a0a00a0a00a... > 0,700,70700,7070070,...


LINKS

Table of n, a(n) for n=0..21.


EXAMPLE

The first "2" is the absolute difference (0+1)(1+2);
the following "1" is the result of (2+1)(2+0);
the following "2" is the result of (1+2)(0+1);
the following "0" is the result of (1+2)(1+2)...


CROSSREFS

Sequence in context: A165163 A153658 A073785 * A206355 A157069 A077540
Adjacent sequences: A102352 A102353 A102354 * A102356 A102357 A102358


KEYWORD

base,easy,nonn


AUTHOR

Eric Angelini, Feb 21 2005


STATUS

approved



