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

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A144323 Shifts left when Dirichlet convolution (DC:(b,b)->a) applied 9 times. 2
 1, 1, 512, 262144, 134348544, 68786454528, 35218798673920, 18032024921047040, 9232396828183582208, 4726987176064286720000, 2420217434180064678903808, 1239151326300193115598749696, 634445479065716907074042200064 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..100 N. J. A. Sloane, Transforms MAPLE k:=9: with(numtheory): dc:= proc(b, c) proc(n) option remember; add(b(d) *c(n/d), d=`if`(n<0, {}, divisors(n))) end end: a:='a': b[1]:= dc(a, a): for t from 2 to k do b[t]:= dc(b[t-1], b[t-1]) od: a:= n-> `if`(n=1, 1, b[k](n-1)): seq(a(n), n=1..20); CROSSREFS 9th column of A144324. Sequence in context: A181244 A181252 A016749 * A320861 A347858 A220303 Adjacent sequences:  A144320 A144321 A144322 * A144324 A144325 A144326 KEYWORD eigen,nonn AUTHOR Alois P. Heinz, Sep 17 2008 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 December 6 11:48 EST 2021. Contains 349563 sequences. (Running on oeis4.)