This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A101293 #20 Jul 16 2025 15:05:17 %S A101293 1,1,3,18,103682,11981655542024930675232002 %N A101293 a(n) = Lucas(n!). %C A101293 The next term is too large to include. %C A101293 The next term has 151 digits. - _Harvey P. Dale_, Jan 04 2018 %H A101293 Alois P. Heinz, <a href="/A101293/b101293.txt">Table of n, a(n) for n = 0..6</a> %F A101293 a(n) = A000032(A000142(n)). %e A101293 L(3!) = 18. %e A101293 L(4!) = 103682. %p A101293 a:= n-> (<<1|1>, <1|0>>^n!. <<2, -1>>)[1, 1]: %p A101293 seq(a(n), n=0..6); # _Alois P. Heinz_, Jul 15 2025 %t A101293 LucasL[Range[0,5]!] (* _Harvey P. Dale_, Jan 04 2018 *) %Y A101293 Cf. A000032, A000142, A063374. %K A101293 nonn,easy %O A101293 0,3 %A A101293 _Parthasarathy Nambi_, Dec 21 2004