A133361 Multiply by 9 and reverse.

1, 9, 18, 261, 9432, 88848, 236997, 3792312, 80803143, 782822727, 3454045407, 36680468013, 711212421033, 7929871190046, 41401704886317, 358679343516273, 7546461904118223, 70046073175181976, 487736675856414036, 4236277072800369834, 60582330255639462183

Offset

1,2

Links

Alois P. Heinz, Table of n, a(n) for n = 1..1000

Formula

a(n) = reverse(9*a(n-1)) where a(1) = 1.

Conjecture: a(n)^(1/n) tends to 10. - Vaclav Kotesovec, Jan 03 2020

Maple

a:= proc(n) option remember; `if`(n=1, 1,
      (s-> parse(cat(s[-i]$i=1..length(s))))(""||(9*a(n-1))))
    end:
seq(a(n), n=1..25);  # Alois P. Heinz, Apr 09 2015

Mathematica

a[n_] := a[n] = If[n==1, 1, IntegerReverse[9a[n-1]]];
a /@ Range[40] (* Jean-François Alcover, Jan 01 2021 *)

Crossrefs

Cf. A036447 (*2), A163632 (*3), A132064 (*4), A045539 (*5), A132078 (*6), A132114 (*7), A132113 (*8).

Sequence in context: A002169 A050685 A278588 * A353183 A005400 A377909

Adjacent sequences: A133358 A133359 A133360 * A133362 A133363 A133364

Keyword

base,nonn

Author

Rachit Agrawal (rachit_agrawal(AT)daiict.ac.in), Oct 26 2007

Extensions

More terms from Alois P. Heinz, Apr 09 2015

Status

approved