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 A203646 Number of arrays of n 0..15 integers with new values introduced in order 0..15 but otherwise unconstrained. 2

%I

%S 1,2,5,15,52,203,877,4140,21147,115975,678570,4213597,27644437,

%T 190899322,1382958545,10480142147,82864869803,682076806005,

%U 5832742192288,51724157478221,474869780161021,4506714279517080,44151953491540255

%N Number of arrays of n 0..15 integers with new values introduced in order 0..15 but otherwise unconstrained.

%C Column 15 of A203647.

%H R. H. Hardin, <a href="/A203646/b203646.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 121*a(n-1) -6685*a(n-2) +223405*a(n-3) -5042947*a(n-4) +81308227*a(n-5) -965408015*a(n-6) +8576039615*a(n-7) -57312583328*a(n-8) +287212533608*a(n-9) -1066335473840*a(n-10) +2866534951280*a(n-11) -5367984964224*a(n-12) +6557974412544*a(n-13) -4622628648960*a(n-14) +1394852659200*a(n-15).

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 04 2012

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Last modified April 18 22:37 EDT 2021. Contains 343091 sequences. (Running on oeis4.)