A136577 Conjectured Hankel transform of A136576(n+1).

1, 1, 0, -16, -256, -4096, 0, 16777216, 4294967296, 1099511627776, 0, -1152921504606846976, -4722366482869645213696, -19342813113834066795298816, 0, 5192296858534827628530496329220096, 340282366920938463463374607431768211456

Offset: 0

Author

Paul Barry, Jan 08 2008

Keywords

• easy
• sign

Comments

a(n+1) is the Hankel transform of A086616. [From Paul Barry, Jun 03 2009]

Formula

a(n)=4^floor(n^2/2)*((1/2-sqrt(2)/2)*cos(3*pi*n/4)+(1/2+sqrt(2)/2)*cos(pi*n/4));