

A095240


Variant of A095236, where first two people choose payphones at the ends.


8



1, 2, 2, 4, 4, 16, 32, 48, 96, 384, 3072, 9216, 36864, 46080, 184320, 483840, 3870720, 7741440, 82575360, 743178240, 23781703680, 59454259200, 475634073600, 2497078886400, 39953262182400, 22473709977600, 85614133248000
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OFFSET

1,2


COMMENTS

A nonmonotonic sequence: a(25) > a(26).
a(n) > a(n+1) for n = 25, 33, 49, 57, 65, 81, 97, 98, 113, 129, 130, 131, 145, 161, 162, 177, 193, 194, 195, 197, ...  Max Alekseyev, Mar 14 2019


LINKS



FORMULA

For n>1, a(n) = 2 * Product_{j=1..n1} 2^(d(n,j)) * (d(n,j))! * (b(n,j)  d(n,j))! (See A095236 for definition and calculation of b(n,j) and d(n,j)).  Simon Wundling, May 21 2023


EXAMPLE

For example, in a 6payphone situation, person A must pick either payphone 1 or payphone 6.


CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



