a(n) = T(2n+5,n), array T as in A055818.

Terms

a(0) =1a(1) =95a(2) =768a(3) =5216a(4) =33024a(5) =201792a(6) =1208320a(7) =7145792a(8) =41919744a(9) =244590496a(10) =1421823232a(11) =8243669664a(12) =47708339712a(13) =275738420864