a(n+1) = 4*a(n) + 11*a(n-1) - 2*a(n-3).

Terms

a(0) =1a(1) =7a(2) =39a(3) =231a(4) =1339a(5) =7819a(6) =45543a(7) =265503a(8) =1547347a(9) =9018835a(10) =52565151a(11) =306373095a(12) =1785671371a(13) =10407659227a(14) =60660275799a(15) =353554011951