a(n) = (2^(n-1)/(2n)!)*Product_{k=1..n} q(k) where q(n) is the denominator of B(2n), the 2n-th Bernoulli number.

A069267

a(n) = (2^(n-1)/(2n)!)*Product_{k=1..n} q(k) where q(n) is the denominator of B(2n), the 2n-th Bernoulli number.

Terms

    a(0) =3a(1) =15a(2) =42a(3) =45a(4) =66a(5) =2730a(6) =180a(7) =765a(8) =3990a(9) =6930a(10) =4140a(11) =40950a(12) =756a(13) =1740a(14) =57288a(15) =58905a(16) =630a(17) =1919190a(18) =16380a(19) =284130a(20) =595980a(21) =434700a(22) =118440a(23) =4873050a(24) =262548a(25) =314820a(26) =175560a(27) =99180a(28) =21240a(29) =681440760

External references