A039990 k th digit of a(n) is the number of different digits within 4 of k (not including k).

11, 111, 122, 212, 221, 1111, 1222, 2122, 2212, 2221, 11111, 12222, 21222, 22122, 22212, 22221, 111111, 122221, 212222, 221222, 222122, 222212, 1111111, 1222212, 1222221, 1333322, 2122221, 2212222, 2221222, 2222122, 2233331, 11111111, 12222122, 12222212

Offset

1,1

Links

Table of n, a(n) for n=1..34.

Crossrefs

Sequence in context: A083278 A039987 A039989 * A269002 A092819 A336523

Adjacent sequences: A039987 A039988 A039989 * A039991 A039992 A039993

Keyword

base,easy,nonn

Author

Erich Friedman

Extensions

Offset corrected and missing 11 and more terms from Sean A. Irvine, Mar 04 2021

Status

approved