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 A039987 k th digit of a(n) = number of different digits within 2 places of k (not including k). 0
 11, 111, 122, 212, 221, 1111, 1221, 2122, 2212, 11111, 12212, 12221, 13322, 21221, 22122, 22331, 111111, 122122, 122212, 122221, 212212, 212221, 221221, 1111111, 1221221, 1222122, 1222212, 2122122, 2122212, 2122221, 2212212, 2212221 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Table of n, a(n) for n=0..31. EXAMPLE 2122 works, since 2=|{1,2}|, 1=|{2,2,2}|, 2=|{2,1,2}| and 2=|{1,2}| CROSSREFS Sequence in context: A231872 A308365 A083278 * A039989 A039990 A269002 Adjacent sequences: A039984 A039985 A039986 * A039988 A039989 A039990 KEYWORD base,easy,nonn AUTHOR Erich Friedman STATUS approved

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Last modified March 2 15:08 EST 2024. Contains 370494 sequences. (Running on oeis4.)