The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A321949 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A321949

Column k=4 of triangle A257673.
(history; published version)

#10 by Susanna Cuyler at Sat Jan 30 22:50:17 EST 2021

STATUS

proposed

approved

#9 by Ilya Gutkovskiy at Sat Jan 30 06:31:04 EST 2021

STATUS

editing

proposed

#8 by Ilya Gutkovskiy at Sat Jan 30 06:14:05 EST 2021

FORMULA

G.f.: (-1 + Product_{k>=1} 1 / (1 - x^k)^k)^4. - Ilya Gutkovskiy, Jan 30 2021

STATUS

approved

editing

#7 by Alois P. Heinz at Fri Nov 30 21:40:26 EST 2018

STATUS

editing

approved

#6 by Alois P. Heinz at Fri Nov 30 21:40:17 EST 2018

LINKS

Alois P. Heinz, <a href="/A321949/b321949.txt">Table of n, a(n) for n = 4..5000</a>

STATUS

approved

editing

#5 by Alois P. Heinz at Fri Nov 30 16:05:49 EST 2018

STATUS

editing

approved

#4 by Alois P. Heinz at Fri Nov 30 16:05:47 EST 2018

NAME

Column k=4 of triangle A257673.

#3 by Alois P. Heinz at Thu Nov 22 06:54:22 EST 2018

MAPLE

b:= proc(n, k) option remember; `if`(n=0, 1, k*add(

b(n-j, k)*numtheory[sigma][2](j), j=1..n)/n)

end:

a:= n-> (k-> add(b(n, k-i)*(-1)^i*binomial(k, i), i=0..k))(4):

seq(a(n), n=4..35);

Discussion

Thu Nov 29

08:37

OEIS Server: This sequence has not been edited or commented on for a week
yet is not proposed for review.  If it is ready for review, please
visit https://oeis.org/draft/A321949 and click the button that reads
"These changes are ready for review by an OEIS Editor."

Thanks.
  - The OEIS Server

#2 by Alois P. Heinz at Thu Nov 22 06:45:21 EST 2018

NAME

allocated for Alois P. Heinz

4

DATA

1, 12, 78, 376, 1509, 5340, 17234, 51796, 147054, 398388, 1037560, 2612520, 6387965, 15221412, 35446980, 80865304, 181076216, 398660292, 864186408, 1846759404, 3894731430, 8113669352, 16710519860, 34049851236, 68687627812, 137257430140, 271842916654

OFFSET

4,2

CROSSREFS

Column k=4 of A257673.

KEYWORD

allocated

nonn

AUTHOR

Alois P. Heinz, Nov 22 2018

STATUS

approved

editing

#1 by Alois P. Heinz at Thu Nov 22 06:41:49 EST 2018

NAME

allocated for Alois P. Heinz

KEYWORD

allocated

STATUS

approved