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 A052225 #9 Jul 02 2025 16:01:58 %S A052225 5,27,141,837,5757,45357,403197,3991677,43545597,518918397,6706022397, %T A052225 93405311997,1394852659197,22230464255997,376610217983997, %U A052225 6758061133823997,128047474114559997,2554547108585471997 %N A052225 (n+1)!*(n+3)-3. %F A052225 a(n) = A001048(n+2) - 3. - _Michel Marcus_, Jun 19 2013 %e A052225 a(2)=27 because 27=(2+1)!*(2+3)-3 or 3*2*1*5-3. %o A052225 (PARI) a(n) = (n+1)!*(n+3) - 3 \\ _Michel Marcus_, Jun 19 2013 %K A052225 nonn,easy %O A052225 1,1 %A A052225 Andreas Ulvaer (aulvaer(AT)yahoo.com), Feb 20 2000 %E A052225 More terms from _James Sellers_, Feb 22 2000