a(n) is the number of terms in expanded form of bivariate polynomial Q_n, where (P_n, Q_n) is defined by: P_0 = x, Q_0 = y, P_(n+1) = P_n + Q_n, Q_(n+1) = P_n * Q_n.
A296516
a(n) is the number of terms in expanded form of bivariate polynomial Q_n, where (P_n, Q_n) is defined by: P_0 = x, Q_0 = y, P_(n+1) = P_n + Q_n, Q_(n+1) = P_n * Q_n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =40a(6) =111a(7) =300a(8) =797a(9) =2098a(10) =5499a(11) =14389a(12) =37634a(13) =98435a(14) =257516a(15) =673827a(16) =1763460a(17) =4615686a(18) =12082137a(19) =31628294
External references
- oeis: A296516