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

Terms

a(0) =0a(1) =0a(2) =3a(3) =1a(4) =10a(5) =7a(6) =29a(7) =28a(8) =81a(9) =93a(10) =222a(11) =283a(12) =601a(13) =820a(14) =1613a(15) =2305a(16) =4302a(17) =6351a(18) =11421a(19) =17260a(20) =30217a(21) =46453a(22) =79742a(23) =124147a(24) =210033a(25) =330084a(26) =552405a(27) =874297a(28) =1451278a(29) =2309191