Convolution of Jacobsthal(n+2) and Pell(n+1).

Terms

a(0) =1a(1) =5a(2) =16a(3) =48a(4) =133a(5) =357a(6) =932a(7) =2392a(8) =6057a(9) =15189a(10) =37800a(11) =93520a(12) =230301a(13) =565045a(14) =1382236a(15) =3373208a(16) =8216033a(17) =19980037a(18) =48525632a(19) =117730352a(20) =285384437a(21) =691295429a(22) =1673567700a(23) =4049615640a(24) =9795168601a(25) =23684692085a(26) =57254031256