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A129886
Sequence a_{h_n} arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition), where a_n = A129878, h_n = A129874.
16
1, 0, 1, 1, 6, 4, 25, 20
OFFSET
1,5
REFERENCES
Jocelyn Quaintance, Combinatoric Enumeration of Two-Dimensional Proper Arrays, Discrete Math., 307 (2007), 1844-1864.
FORMULA
See Quaintance reference for generating functions that produce A129872-A129886.
CROSSREFS
Sequence in context: A061592 A081631 A137174 * A133837 A211945 A121682
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, May 26 2007
STATUS
approved