The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A167560 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A167560

The ED2 array read by ascending antidiagonals
(history; published version)

#21 by R. J. Mathar at Fri Jun 28 06:23:38 EDT 2024

STATUS

editing

approved

#20 by R. J. Mathar at Fri Jun 28 06:23:20 EDT 2024

MAPLE

# alternative

A167560 := proc(n, m)

option remember ;

if m > n then

n!+add( (-1)^(k-1)*binomial(n-1, k)*procname(n, m-k), k=1..n-1) ;

else

4^(m-1)*(m-1)!*(n+m-1)!/(2*m-1)! ;

end if;

end proc:

seq( seq(A167560(d-m, m), m=1..d-1), d=2..12) ; # R. J. Mathar, Jun 28 2024

STATUS

approved

editing

#19 by Joerg Arndt at Thu Jan 12 11:41:09 EST 2023

STATUS

reviewed

approved

#18 by Michel Marcus at Thu Jan 12 10:16:31 EST 2023

STATUS

proposed

reviewed

#17 by Eyal Gruss at Thu Jan 12 07:44:41 EST 2023

STATUS

editing

proposed

#16 by Eyal Gruss at Thu Jan 12 07:42:27 EST 2023

CROSSREFS

A090238 without the first column, read by rows. - Eyal Gruss, Jan 12 2023

Discussion

Thu Jan 12

07:44

Eyal Gruss: my bad. indeed i jumped to conclusions based on the first 5 rows / 10 terms. redacted.

#15 by Michel Marcus at Thu Jan 12 03:28:27 EST 2023

NAME

The ED2 array read by ascending antidiagonals

LINKS

Johannes W. Meijer, <a href="/A167560/a167560.jpg">The four Escher-Droste arrays, <a href="/A167560/a167560.jpg">jpg image</a>, Mar 08 2013.

CROSSREFS

A090238 without the first column, read by rows _. - _Eyal Gruss_, Jan 12 2023

STATUS

proposed

editing

Discussion

Thu Jan 12

03:29

Michel Marcus: are you sure ??  I see 120,     72,     30,     8,     1 instead of 120, 80, 32, 8, 1

#14 by Eyal Gruss at Thu Jan 12 03:22:59 EST 2023

STATUS

editing

proposed

#13 by Eyal Gruss at Thu Jan 12 03:21:14 EST 2023

CROSSREFS

A090238 without the first column, read by rows Eyal Gruss, Jan 12 2023

STATUS

approved

editing

#12 by N. J. A. Sloane at Thu Jun 16 23:27:41 EDT 2016

CROSSREFS

A167565 is a triangle related to the a(n) formulae formulas of the rows of the ED2 array.

A167568 is a triangle related to the GF(z) formulae formulas of the rows of the ED2 array.

Discussion

Thu Jun 16

23:27

OEIS Server: https://oeis.org/edit/global/2523