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%I #30 Oct 24 2023 07:02:09
%S 2,2,6,22,48,160,636,3556,19488,95872,594320,4459888,32131648,
%T 227072544,1875064880,17851780784,165367171136,1506506453568,
%U 15540217445728,179708231523680,2034547787823488,22716589497430656
%N Number of extended Skolem sequences of order n.
%D CRC Handbook of Combinatorial Designs, 1996, p. 460.
%H Jeppe Winther Larsen, <a href="https://pdfs.semanticscholar.org/6377/9c279f8e27f5ed46ff6fe5c0624eebe5de7e.pdf">Counting the Skolem sequences using inclusion-exclusion</a>, 2009
%K nonn,more
%O 1,1
%A _N. J. A. Sloane_
%E a(15)-a(18) from Jeppe Winther Larsen (jwl(AT)itu.dk), Oct 12 2009
%E a(19)-a(21) from _Fausto A. C. Cariboni_, Apr 19 2017
%E a(22) from _Fausto A. C. Cariboni_, May 07 2017
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