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 A380048 #10 Jan 11 2025 18:49:38 %S A380048 0,1,3,22,135,985,7224,55627,436653,3503666,28537245,235558347, %T A380048 1965437136,16552173909,140505456663,1200968926590,10327551834411, %U A380048 89286693775373,775611959272392,6766372185052247,59256729852910425,520754062920338026,4590973472772299193,40591542233796808247 %N A380048 a(n) = A000045(n) * A001003(n). %F A380048 G.f.: 1/(4*x)-sqrt(16*x^2*(3+6*x+2*x^2)+32*x^2*sqrt(1-6*x-33*x^2+6*x^3+x^4))/(16*sqrt(5)*x^2). %F A380048 a(n) = A000045(n) * A001003(n). %Y A380048 Cf. A000045, A001003. %K A380048 nonn,easy %O A380048 0,3 %A A380048 _Vladimir Kruchinin_, Jan 11 2025