Number of set partitions of [n] where all prime-indexed blocks are singletons.

A332398

Number of set partitions of [n] where all prime-indexed blocks are singletons.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =17a(6) =40a(7) =105a(8) =304a(9) =958a(10) =3255a(11) =11851a(12) =46096a(13) =191648a(14) =854551a(15) =4101826a(16) =21213282a(17) =117747119a(18) =695773801a(19) =4332490151a(20) =28149712546a(21) =189300600481

External references