login
A129881
Sequence i_{s_n} arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition), where i_n = A129876, s_n = A129873.
1
2, 2, 6, 6, 22, 24, 90, 100
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: A128057 A128014 A135401 * A132369 A282169 A081123
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, May 26 2007
STATUS
approved