a(n) = -a(n-6) + 3*a(n-5) + a(n-4) - 7*a(n-3) + a(n-2) + 3*a(n-1).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =0a(7) =-3a(8) =-13a(9) =-39a(10) =-107a(11) =-273a(12) =-675a(13) =-1624a(14) =-3847a(15) =-8995a(16) =-20851a(17) =-47995a(18) =-109915a(19) =-250695a(20) =-570024a(21) =-1292915a(22) =-2926953a(23) =-6616051a(24) =-14936895a(25) =-33690357a(26) =-75931283a(27) =-171029936a(28) =-385046687a(29) =-866536007