1864131

Appears in sequences

• a(n) = 4*a(n-1) + n with n > 1, a(1)=1.at n=10A014825
• Alternating sum transform (PSumSIGN) of A000975.at n=21A034299
• Expansion of 1/((1-2*x)*(1-x^2)^2).at n=20A091919