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A129875 Sequence t_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition). 2
0, 2, 4, 9, 22, 45, 120, 239 (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: A217976 A156801 A057580 * A055094 A055729 A317735

Adjacent sequences:  A129872 A129873 A129874 * A129876 A129877 A129878

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, May 26 2007

STATUS

approved

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Last modified February 19 10:03 EST 2020. Contains 332041 sequences. (Running on oeis4.)