Convolution of Pell(n) and 2^n.

Terms

a(0) =0a(1) =1a(2) =4a(3) =13a(4) =38a(5) =105a(6) =280a(7) =729a(8) =1866a(9) =4717a(10) =11812a(11) =29365a(12) =72590a(13) =178641a(14) =438064a(15) =1071153a(16) =2613138a(17) =6362965a(18) =15470140a(19) =37565389a(20) =91125206a(21) =220864377a(22) =534951112a(23) =1294960905a(24) =3133261530a(25) =7578261181a(26) =18323338324a(27) =44292046693a(28) =107041649438a(29) =258643781025