Numbers n such that n divides the denominator of 2n-th Bernoulli number.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =10a(5) =21a(6) =30a(7) =42a(8) =78a(9) =110a(10) =210a(11) =330a(12) =390a(13) =546a(14) =903a(15) =930a(16) =1218a(17) =1806a(18) =1830a(19) =2310a(20) =2530a(21) =2730a(22) =4134a(23) =4290a(24) =6090a(25) =6162a(26) =6510a(27) =7590a(28) =9030a(29) =10230