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.

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.

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: A061592 A081631 A137174 * A133837 A211945 A121682

Adjacent sequences: A129883 A129884 A129885 * A129887 A129888 A129889

Keyword

nonn,more

Author

N. J. A. Sloane, May 26 2007

Status

approved