[seqfan] Re: Fwd: Re: A000207: Maple-Program wrong

[Joseph S. Myers]

On Mon, 20 Apr 2009, Rainer Rosenthal wrote:

> Joseph S. Myers schrieb:
> > On Sun, 19 Apr 2009, Rainer Rosenthal wrote:
> > 
> >> As I said I've come across A000207 when I counted these figures, made
> >> up of n copies of an equilateral triangle:
> > 
> > But that's A000577 not A000207.
> > 
> Ah - got it! I was so happy having reproduced the numbers of polynomioes
> for n from 1 to 6 that I believed in the output of my program for larger
> values of n too naively :-(
> 
> I will have to go back to the drawing board. Sequence A000577 is nearly
> what I was trying to compute, but not quite: I don't like holes in my
> polynomioes, but holes are allowed in A000577.

If you don't allow holes, it's A070765.

-- 
Joseph S. Myers
jsm at polyomino.org.uk