a(n) = A136156(n) + 1.

Terms

a(0) =3a(1) =2a(2) =3a(3) =31a(4) =25a(5) =2a(6) =721a(7) =16a(8) =561a(9) =13a(10) =3628801a(11) =11a(12) =479001601a(13) =361a(14) =9a(15) =316a(17) =281a(19) =7a(20) =241a(21) =1814401a(23) =6a(24) =1596673a(25) =239500801a(26) =1478401a(27) =181