Denominators of generalized Bernoulli numbers.

Terms

a(0) =1a(1) =3a(2) =18a(3) =90a(4) =270a(5) =1134a(6) =5670a(7) =2430a(8) =7290a(9) =133650a(10) =112266a(11) =1990170a(12) =9950850a(13) =2296350a(14) =984150a(15) =117113850a(16) =351341550a(17) =33657930a(18) =21597171750a(19) =3410079750a(20) =572893398a(21) =33613643250a(22) =834229509750a(23) =108812544750a(24) =544062723750a(25) =18280507518a(26) =105464466450