Odd numbers in the triangle of Stirling numbers of the second kind (A008277).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =7a(8) =1a(9) =1a(10) =15a(11) =25a(12) =1a(13) =1a(14) =31a(15) =65a(16) =15a(17) =1a(18) =1a(19) =63a(20) =301a(21) =21a(22) =1a(23) =1a(24) =127a(25) =1701a(26) =1a(27) =1a(28) =255a(29) =3025