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%I #33 Nov 03 2023 11:47:26
%S 5,15,365,945
%N A puzzle sequence, answer unknown.
%C Possible solution is a(1) = 5; a(n) = 5 + 5 * n * A215148(n-1), giving 5, 15, 365, 945, 1755, 2795, 4065, 5565, 7295, 9255, 11445, 13865, 16515, 19395, ... . - _Michal Paulovic_, Sep 15 2023
%H Floor en Lyanne van Lamoen, <a href="http://list.seqfan.eu/pipermail/seqfan/2005-November/043712.html">puzzle sequences</a> from "Ask Dr. Math". Nov 28, 2005.
%Y Cf. A215148.
%K nonn,unkn
%O 1,1
%A _N. J. A. Sloane_, Nov 24 2005
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