a(n) = 3*a(n-1) - 3*a(n-2) + 3*a(n-3) - 3*a(n-4) + a(n-5) for n >= 1, where a(0) = 2, a(1) = 4, a(2) = 7. a(3) = 11, a(4) = 20.

A288380

a(n) = 3*a(n-1) - 3*a(n-2) + 3*a(n-3) - 3*a(n-4) + a(n-5) for n >= 1, where a(0) = 2, a(1) = 4, a(2) = 7. a(3) = 11, a(4) = 20.

Terms

    a(0) =2a(1) =4a(2) =7a(3) =11a(4) =20a(5) =38a(6) =70a(7) =130a(8) =245a(9) =461a(10) =866a(11) =1630a(12) =3070a(13) =5780a(14) =10883a(15) =20495a(16) =38596a(17) =72682a(18) =136874a(19) =257762a(20) =485417a(21) =914137a(22) =1721506a(23) =3241946a(24) =6105242a(25) =11497412a(26) =21651967a(27) =40775059a(28) =76787732a(29) =144606926

External references