A129874 Sequence h_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition).

2, 1, 4, 4, 16, 19, 76, 98

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: A057772 A145861 A191660 * A021983 A349994 A375123

Adjacent sequences: A129871 A129872 A129873 * A129875 A129876 A129877

Keyword

nonn,more

Author

N. J. A. Sloane, May 26 2007

Status

approved