[seqfan] Re: Nonattacking queens on a quarter-boar

[Rob Pratt]

For n = 1 to 100, here are the exceptions to the "pairs increasing by 1" pattern:

a(1) = a(2) = a(3) = 1
a(12) = a(13) = a(14) = 6
a(27) = a(28) = a(29) = 13
a(44) = a(45) = a(46) = 21
a(59) = a(60) = a(61) = 28
a(74) = a(75) = a(76) = 35
a(89) = a(90) = a(91) = 42

-----Original Message-----
From: SeqFan [mailto:seqfan-bounces at list.seqfan.eu] On Behalf Of Bob Selcoe
Sent: Sunday, June 04, 2017 12:37 PM
To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
Subject: [seqfan] Re: Nonattacking queens on a quarter-boar

EXTERNAL

Rob,

A hunch -  do a(65..67) = 31 and a(88..90) = 42, while all other terms a(51..87) appear in pairs, increasing by 1?

Cheers,
Bob Selcoe

Sent from my iPhone

> On Jun 4, 2017, at 10:15 AM, Rob Pratt <Rob.Pratt at sas.com> wrote:
>
> The first 50 terms are:
> 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 21, 22, 22, 23, 23
>
> The sequence for odd boards is already here: http://oeis.org/A274933
>
> -----Original Message-----
> From: SeqFan [mailto:seqfan-bounces at list.seqfan.eu] On Behalf Of Neil Sloane
> Sent: Sunday, June 04, 2017 10:55 AM
> To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
> Subject: [seqfan] Nonattacking queens on a quarter-boar
>
> EXTERNAL
>
> For an application I needed this new sequence, A287864, which I did by hand
> - needs more terms
>
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>
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