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A129878 Sequence a_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition). 5
1, 3, 10, 42, 178, 787, 3552, 16319 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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: A295236 A214835 A149059 * A094558 A074511 A000249

Adjacent sequences:  A129875 A129876 A129877 * A129879 A129880 A129881

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, May 26 2007

STATUS

approved

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Last modified June 24 05:58 EDT 2021. Contains 345416 sequences. (Running on oeis4.)