454950

Appears in sequences

• a(n) = 3*trinomial(n+1,0) - trinomial(n+2,0).at n=15A103872
• Number of numbers that yield an n-digit number after Reverse and Add!.at n=5A232731
• Expansion of ( (1 + 3*x)/(1 - x) )^(1/2).at n=17A372023