The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A057270 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A057270

Triangle T(n,k) of number of unilaterally connected digraphs on n unlabeled nodes with k arcs, k=0..n*(n-1).
(history; published version)

#12 by Alois P. Heinz at Fri May 27 21:12:41 EDT 2022

STATUS

proposed

approved

#11 by Sean A. Irvine at Fri May 27 17:35:47 EDT 2022

STATUS

editing

proposed

#10 by Sean A. Irvine at Fri May 27 17:35:25 EDT 2022

DATA

1, 0, 1, 1, 0, 0, 1, 4, 4, 1, 1, 0, 0, 0, 1, 10, 30, 45, 38, 27, 13, 5, 1, 1, 0, 0, 0, 0, 1, 20, 136, 462, 972, 1412, 1639, 1485, 1152, 707, 379, 154, 61, 16, 5, 1, 1, 0, 0, 0, 0, 0, 1, 35, 437, 2833, 11325, 31615, 67207, 115344, 165762, 204723, 219866, 206986, 170920, 124088, 78809, 43860, 21209, 8951, 3242, 1043, 288, 76, 17, 5, 1, 1

KEYWORD

more,nonn,tabf

EXTENSIONS

More terms from Sean A. Irvine, May 27 2022

STATUS

approved

editing

#9 by R. J. Mathar at Fri Jun 14 03:55:11 EDT 2013

STATUS

editing

approved

#8 by R. J. Mathar at Fri Jun 14 03:55:08 EDT 2013

AUTHOR

_Vladeta Jovovic, _, Goran Kilibarda (vladeta(AT)eunet.rs), , Aug 23 2000

STATUS

approved

editing

#7 by Charles R Greathouse IV at Thu Apr 12 11:18:55 EDT 2012

STATUS

editing

approved

#6 by Charles R Greathouse IV at Thu Apr 12 11:18:53 EDT 2012

KEYWORD

more,nonn,tabf

STATUS

approved

editing

#5 by R. J. Mathar at Wed Sep 28 15:23:31 EDT 2011

STATUS

editing

approved

#4 by R. J. Mathar at Wed Sep 28 15:23:26 EDT 2011

REFERENCES

R. W. Robinson, Counting strong digraphs (research announcement), J. Graph Theory 1, 1977, pp. 189-190.

LINKS

R. W. Robinson, <a href="http://dx.doi.org/10.1002/jgt.3190010215">Counting strong digraphs (research announcement)</a>, J. Graph Theory 1, 1977, pp. 189-190.

STATUS

approved

editing

#3 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

KEYWORD

more,nonn,new

AUTHOR

Vladeta Jovovic, Goran Kilibarda (vladeta(AT)Euneteunet.yurs), Aug 23 2000