[seqfan] Re: Missing sequences

[rkg]

So A007482 is (also) the number of ways of tiling a
3 by n-1 rectangle with 1x1 squares, 2x2 squares and
2x1 (vertical) dominoes.  R.

On Tue, 19 May 2015, rkg wrote:

> Many thanks for this!  It underlines my ignorance of
> what is meant by ``offset''.  The zeroes are very
> much a part of the sequences, which also have
> values of a(-n).  Que faire ??   R.
>
> On Tue, 19 May 2015, israel at math.ubc.ca wrote:
>
>> Without the 0's, these seem to be A007482 and A049072.
>>
>> Cheers,
>> Robert
>>
>> On May 19 2015, rkg wrote:
>>
>>> Dear all,
>>>          I'm not a good looker, but I didn't find either of the
>>> sequences
>>>
>>> 0,1,3,11,39,139,495,...
>>>
>>> 0,1,3,5,3,-11,-45,-91,...
>>>
>>> in OEIS.  There still seems to be room for a few hundred more
>>> divisibility sequences satisfying second order recurrences.
>>> Many of them count combinatorial objects.  I'm sorry that I
>>> don't have the expertise to submit them myself.   R.
>>>
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>>
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