[seqfan] Re: polyotessamino defn in A059573

Richard J. Mathar mathar at mpia-hd.mpg.de
Fri May 24 19:03:31 CEST 2019

pm> Date: Mon, 13 May 2019 07:17:13 +0100
pm> From: "Peter Munn" <techsubs at pearceneptune.co.uk>
pm> To: "Sequence Fanatics Discussion list" <seqfan at list.seqfan.eu>
pm> Subject: [seqfan] Re: polyotessamino defn in A059573
pm> ..
pm> I get 8 if the definition means that you cannot use only 1 domino if there
pm> is a configuration with 2 dominoes, and you fix the 4-omino in position
pm> and count different ways of placing the dominoes. So I get 2 ways for the
pm> block 4-omino; 1 way (0 incomplete, as disallowed) for each of L shaped,
pm> I-shaped and N-shaped; and 3 ways (all incomplete) for the T-shaped.
pm> ..

This explains why A059573(4,2)=8, but then I get A0539537(5,2)=35, not 34.
For the illustration see http://www.mpia.de/home/mathar/progs/a059573.pdf .
Is A059573 just not correct ?


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