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 A341920 #14 Feb 08 2022 12:13:06 %S A341920 1,5,20,85,385,1836,9120,46805,246675,1328925,7292688,40652780, %T A341920 229698220,1313175880,7585060680,44212723797,259808593975, %U A341920 1537840085775,9162371040900,54913015836525,330888232445505,2003659057873200,12187811305300800,74444226847892460,456458831442283860 %N A341920 Number of simple strong triangulations of a fixed pentagon with n interior nodes. %H A341920 Andrew Howroyd, <a href="/A341920/b341920.txt">Table of n, a(n) for n = 1..500</a> %F A341920 From _Peter Bala_, Feb 06 2022: (Start) %F A341920 Conjectures: %F A341920 a(n) = 5*(5*n-3)*binomial(3*n,n)/((n+1)*(2*n+1)*(2*n+3)). %F A341920 a(n+1) = 3*(3*n+1)*(3*n+2)*(5*n+2)/(2*(n+2)*(2*n+5)*(5*n-3))*a(n). (End) %o A341920 (PARI) R(25,2) \\ R defined in A210664. %Y A341920 Row m = 2 of A210664. %Y A341920 Cf. A000256, A341917. %K A341920 nonn %O A341920 1,2 %A A341920 _Andrew Howroyd_, Feb 24 2021