

A129874


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


2




OFFSET

1,1


REFERENCES

Jocelyn Quaintance, Combinatoric Enumeration of TwoDimensional Proper Arrays, Discrete Math., 307 (2007), 18441864.


LINKS



FORMULA

See Quaintance reference for generating functions that produce A129872A129886.


CROSSREFS



KEYWORD

nonn,more


AUTHOR



STATUS

approved



