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

0,4

Comments

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

Links

Table of n, a(n) for n=0..16.

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));

Crossrefs

Sequence in context: A222932 A220107 A171290 * A190134 A267792 A220252

Adjacent sequences: A136574 A136575 A136576 * A136578 A136579 A136580

Keyword

easy,sign

Author

Paul Barry, Jan 08 2008

Status

approved