login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A005016 Certain subgraphs of a directed graph.
(Formerly M3007)
1
1, 1, 3, 15, 159, 3903, 214143, 25098495, 6110517759, 3040867308543, 3064498377754623, 6220489664197758975, 25354161321592779612159, 207142125428402158677213183, 3388838467537660347660899221503 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=0..14.

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

FORMULA

G.f.: Sum(x^n*Product((2^i-1)/(1+(2^i-2)*x),i = 1 .. n),n = 0 .. infinity). - Vladeta Jovovic, Mar 10 2008

CROSSREFS

Cf. A005321.

Sequence in context: A136519 A102556 A016065 * A304998 A105611 A108975

Adjacent sequences:  A005013 A005014 A005015 * A005017 A005018 A005019

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Vladeta Jovovic, Mar 10 2008

a(0), a(14) from Max Alekseyev, May 04 2010

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 November 15 21:37 EST 2019. Contains 329168 sequences. (Running on oeis4.)