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 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 (list; graph; refs; listen; history; text; internal format)
 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 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

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Last modified August 9 05:12 EDT 2020. Contains 336319 sequences. (Running on oeis4.)