Satisfies the recurrence a(n) = 3*a(n-1)-a(n-2)+a(n-3)-2*a(n-4)+2*a(n-5).

Terms

a(0) =1a(1) =3a(2) =9a(3) =23a(4) =63a(5) =171a(6) =461a(7) =1247a(8) =3371a(9) =9111a(10) =24629a(11) =66575a(12) =179959a(13) =486451a(14) =1314933a(15) =3554415a(16) =9607995a(17) =25971519a(18) =70204013a(19) =189769551a(20) =512968999a(21) =1386614411a(22) =3748178797a(23) =10131759903a(24) =27387316427a(25) =74031077351a(26) =200114546757a(27) =540932717135