A129883 Sequence i_{h_n} arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition), where i_n = A129876, h_n = A129874.

2, 0, 2, 2, 10, 6, 34, 88

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: A046277 A053571 A307391 * A293578 A098489 A128064

Adjacent sequences: A129880 A129881 A129882 * A129884 A129885 A129886

Keyword

nonn,more

Author

N. J. A. Sloane, May 26 2007

Status

approved