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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A259971 Triangle read by rows: coefficients xi(n,k) arising from the study of completely transitive graphs on n nodes. 3
1, 1, 1, 2, 5, 3, 10, 40, 51, 21, 122, 644, 1236, 1029, 315, 3346, 21496, 54060, 66780, 40635, 9765, 196082, 1471460, 4527228, 7328580, 6596100, 3134565, 615195 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..28.

E. Andresen, K. Kjeldsen, On certain subgraphs of a complete transitively directed graph, Discrete Math. 14 (1976), no. 2, 103-119.

EXAMPLE

Triangle begins:

1,

1,1,

2,5,3,

10,40,51,21,

122,644,1236,1029,315,

3346,21496,54060,66780,40635,9765,

196082,1471460,4527228,7328580,6596100,3134565,615195,

...

CROSSREFS

Cf. A259971, A259970.

Diagonals include A005321, A005330

Row sums are also A005321.

Sequence in context: A138765 A097753 A120860 * A091809 A110315 A275677

Adjacent sequences:  A259968 A259969 A259970 * A259972 A259973 A259974

KEYWORD

nonn,more,tabl

AUTHOR

N. J. A. Sloane, Jul 11 2015

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 25 21:00 EST 2020. Contains 332258 sequences. (Running on oeis4.)