a(n) = A226158(n) - 2*A226158(n+1).

Terms

a(0) =2a(1) =1a(2) =-1a(3) =-2a(4) =1a(5) =6a(6) =-3a(7) =-34a(8) =17a(9) =310a(10) =-155a(11) =-4146a(12) =2073a(13) =76454a(14) =-38227a(15) =-1859138a(16) =929569a(17) =57641238a(18) =-28820619a(19) =-2219305810a(20) =1109652905a(21) =103886563462a(22) =-51943281731