16475640050domain: NAppears in sequencesExpansion of (1-3*x)/(1-5*x+3*x^2+x^3).at n=17A232970Indices of centered pentagonal numbers (A005891) that are also triangular numbers (A000217).at n=17A254627Upper (1/2)-midsequence of (F(2n)) and (F(2n+1)), where F=A000045 (Fibonacci numbers); see Comments.at n=25A387779