Odd bisection of A260443 (the even terms): a(n) = A260443((2*n)+1).

Terms

a(0) =2a(1) =6a(2) =18a(3) =30a(4) =90a(5) =270a(6) =450a(7) =210a(8) =630a(9) =6750a(10) =20250a(11) =9450a(12) =15750a(13) =47250a(14) =22050a(15) =2310a(16) =6930a(17) =330750a(18) =3543750a(19) =1653750a(20) =4961250a(21) =53156250a(22) =24806250a(23) =727650a(24) =1212750a(25) =57881250a(26) =173643750a(27) =18191250a(28) =8489250a(29) =25467750