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A129877 Sequence i_{a_n} arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition), where i_n is A129876, a_n is A129878. 0
2, 0, 6, 12, 58, 220, 958, 4184 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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: A078048 A335061 A110667 * A307581 A261566 A247443

Adjacent sequences:  A129874 A129875 A129876 * A129878 A129879 A129880

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, May 26 2007

STATUS

approved

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Last modified June 17 13:43 EDT 2021. Contains 345080 sequences. (Running on oeis4.)