The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A086929 a(1) = 1, a(n) = n times (the digit reversal of the (n-1)-th partial sum). 1
 1, 2, 9, 84, 345, 864, 35217, 180504, 5586408, 43430850, 530676234, 9780239700, 1055666381913, 18372986892414, 818136466402365, 314063593211808, 139031163059145687, 9080662161749058738, 64855015790195124351 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Robert Israel, Table of n, a(n) for n = 1..438 EXAMPLE a(5) = 5*(reversal of (1+2+9+84)) = 5*(rev(96)) = 5*69 = 345. MAPLE digrev:= proc(n) local L, i;   L:= convert(n, base, 10);   add(L[-i]*10^(i-1), i=1..nops(L)) end proc: A[1]:= 1: S:= 1: for n from 2 to 20 do A[n]:= n*digrev(S); S:= S + A[n] od: seq(A[i], i=1..20); # Robert Israel, Jun 02 2020 CROSSREFS Sequence in context: A323769 A296581 A069234 * A193466 A262011 A120959 Adjacent sequences:  A086926 A086927 A086928 * A086930 A086931 A086932 KEYWORD base,nonn AUTHOR Amarnath Murthy, Sep 19 2003 EXTENSIONS More terms from Ray Chandler, Sep 23 2003 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 16 18:51 EDT 2021. Contains 345067 sequences. (Running on oeis4.)