42993

Appears in sequences

• Expansion of (1-x)^2/((1-x)^3-4x^4).at n=15A097121
• G.f. Sum_{n>=0} Series_Reversion( x/(1+x)^n )^n.at n=8A299044
• a(n) = 21*2^n - 15.at n=11A305158