Convolution of A000295(n+2) (n>=0) with itself.

Terms

a(0) =1a(1) =8a(2) =38a(3) =140a(4) =443a(5) =1268a(6) =3384a(7) =8584a(8) =20965a(9) =49744a(10) =115402a(11) =262996a(12) =590831a(13) =1311900a(14) =2884956a(15) =6293040a(16) =13633305a(17) =29362200a(18) =62916910a(19) =134220380a(20) =285215651a(21) =603983108a(22) =1275072128a(23) =2684358680a(24) =5637149133a(25) =11811165088