-6291456

Appears in sequences

• Expansion of (1-x^2)/(1+2x).at n=23A110164
• Triangle T, read by rows, where matrix power T^4 has powers of 4 in the secondary diagonal: [T^4](n+1,n) = 4^(n+1), with all 1's in the main diagonal and zeros elsewhere.at n=33A117254
• a(n) = b(n+1)-2b(n) where b() is A134812.at n=44A134813
• Expansion of (7+8*x)/(1+2*x).at n=21A176414
• Expansion of Product_{k>0} (1 - 2^(k-1)*x^k).at n=27A337299