a(n)*a(n+3) - a(n+1)*a(n+2) = 3, given a(0)=a(1)=1, a(2)=4.

Terms

a(0) =1a(1) =1a(2) =4a(3) =7a(4) =31a(5) =55a(6) =244a(7) =433a(8) =1921a(9) =3409a(10) =15124a(11) =26839a(12) =119071a(13) =211303a(14) =937444a(15) =1663585a(16) =7380481a(17) =13097377a(18) =58106404a(19) =103115431a(20) =457470751a(21) =811826071a(22) =3601659604a(23) =6391493137a(24) =28355806081a(25) =50320119025a(26) =223244789044