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 A300517 a(n) is the concatenation n n times, n-1 n-1 times , ... , 22, 1. 2
 1, 221, 333221, 4444333221, 555554444333221, 666666555554444333221, 7777777666666555554444333221, 888888887777777666666555554444333221, 999999999888888887777777666666555554444333221, 10101010101010101010999999999888888887777777666666555554444333221 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..31 MAPLE a:= n-> parse(cat(seq((n-i)\$(n-i), i=0..n-1))): seq(a(n), n=1..12);  # Alois P. Heinz, Mar 07 2018 PROG (Ruby) def A300517(n)   a = '1'   [1] + (2..n).map{|i| a = (i.to_s * i + a.to_s).to_i} end p A300517(20) CROSSREFS Cf. A000461, A098129. Sequence in context: A048902 A210135 A013548 * A083958 A083959 A078212 Adjacent sequences:  A300514 A300515 A300516 * A300518 A300519 A300520 KEYWORD nonn,base AUTHOR Seiichi Manyama, Mar 07 2018 STATUS approved

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Last modified January 21 03:58 EST 2022. Contains 350473 sequences. (Running on oeis4.)