A002321*A000079.

Terms

a(0) =1a(1) =0a(2) =-4a(3) =-8a(4) =-32a(5) =-32a(6) =-128a(7) =-256a(8) =-512a(9) =-512a(10) =-2048a(11) =-4096a(12) =-12288a(13) =-16384a(14) =-16384a(15) =-32768a(16) =-131072a(17) =-262144a(18) =-786432a(19) =-1572864a(20) =-2097152a(21) =-2097152a(22) =-8388608a(23) =-16777216a(24) =-33554432a(25) =-33554432a(26) =-67108864a(27) =-134217728a(28) =-536870912a(29) =-1610612736