A151912 Expansion of (1-8x-8x^3)/(1-2x+4x^2)^2.

1, -4, -28, -56, 32, 416, 832, -256, -4864, -9728, 2048, 51200, 102400, -16384, -507904, -1015808, 131072, 4849664, 9699328, -1048576, -45088768, -90177536, 8388608, 411041792, 822083584, -67108864, -3690987520, -7381975040

Offset: 0

Author

Paul Barry, Mar 15 2008

Keywords

• easy
• sign

Comments

2*a(n) is the Hankel transform of A066796.

Links

• Index entries for linear recurrences with constant coefficients, signature (4,-12,16,-16).

Formula

a(n)=2^n*A138341(n);