A (25,-29) Somos-4 sequence.A188315A (25,-29) Somos-4 sequence.Terms a(0) =1a(1) =1a(2) =-4a(3) =-129a(4) =-3689a(5) =-113689a(6) =7001471a(7) =7911171596External referencesoeis: A188315