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A144318 Shifts left when Dirichlet convolution (DC:(b,b)->a) applied 4 times. 2
1, 1, 16, 256, 4216, 67456, 1083136, 17330176, 277344816, 4437547776, 71001776256, 1136028420096, 18176471920896, 290823550734336, 4653177071702016, 74450833163421696, 1191213334782285596, 19059413356516569536, 304950613771087329536, 4879209820337397272576 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
N. J. A. Sloane, Transforms
MAPLE
k:=4: 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..30);
CROSSREFS
4th column of A144324.
Sequence in context: A229101 A220175 A001025 * A230142 A247165 A204080
KEYWORD
eigen,nonn
AUTHOR
Alois P. Heinz, Sep 17 2008
STATUS
approved

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Last modified February 22 20:06 EST 2024. Contains 370260 sequences. (Running on oeis4.)