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 A387267 #16 Sep 03 2025 23:25:05
%S A387267 0,1,1,3,7,8,19,31,47,87,135,219,371,579,947,1535,2423,3919,6239,9891,
%T A387267 15803,24987,39563,62663,98751,155815,245431,385771,606467,951795,
%U A387267 1492323,2338703,3660551,5725951,8950543,13978931,21820235,34037067,53059643,82670167
%N A387267 Number of dissections of a convex n-gon into quadrilaterals and pentagons by strictly disjoint diagonals.
%C A387267 Strictly disjoint diagonals means that the diagonals are non-crossing and may not share endpoints.
%H A387267 Muhammed Sefa Saydam, <a href="/A387267/b387267.txt">Table of n, a(n) for n = 3..100</a>
%F A387267 a(n) = T(n-3) + Sum_{i=1..n-8} T(i)*( T(n-i-4) + T(n-i-7) ) + Sum_{i=n-7..n-5} T(i)*( 1 + T(n-i-4) ) for n >= 9 and T(n) = A159284(n).
%Y A387267 Cf. A093128, A159284, A387224.
%K A387267 nonn,new
%O A387267 3,4
%A A387267 _Muhammed Sefa Saydam_, Aug 24 2025