a(n) = Sum_{k=0..n} (-1)^k * binomial(n, k) * A000931(n-k+4).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =1a(4) =0a(5) =-3a(6) =10a(7) =-24a(8) =49a(9) =-89a(10) =145a(11) =-208a(12) =245a(13) =-174a(14) =-176a(15) =1121a(16) =-3185a(17) =7137a(18) =-13920a(19) =24301a(20) =-37926a(21) =51256a(22) =-53615a(23) =20407a(24) =97265a(25) =-386224a(26) =984549a(27) =-2083934a(28) =3896480a(29) =-6537023