Duplicate of A065034.

Terms

a(0) =3a(1) =4a(2) =8a(3) =19a(4) =48a(5) =124a(6) =323a(7) =844a(8) =2208a(9) =5779a(10) =15128a(11) =39604a(12) =103683a(13) =271444a(14) =710648a(15) =1860499a(16) =4870848a(17) =12752044a(18) =33385283a(19) =87403804a(20) =228826128a(21) =599074579a(22) =1568397608a(23) =4106118244a(24) =10749957123a(25) =28143753124