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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
OFFSET
1,1
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: A357367 A110667 A347929 * A371913 A307581 A261566
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, May 26 2007
STATUS
approved