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!)
A129879 Sequence a_{a_n} arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition), where a_n is A129878. 0
1, 0, 3, 9, 42, 182, 821, 3754 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

Jocelyn Quaintance, Combinatoric Enumeration of Two-Dimensional Proper Arrays, Discrete Math., 307 (2007), 1844-1864.

LINKS

Table of n, a(n) for n=1..8.

FORMULA

See Quaintance reference for generating functions that produce A129872-A129886.

CROSSREFS

Sequence in context: A249045 A183306 A057724 * A264521 A001427 A020128

Adjacent sequences:  A129876 A129877 A129878 * A129880 A129881 A129882

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, May 26 2007

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 June 20 15:21 EDT 2021. Contains 345165 sequences. (Running on oeis4.)