Number of partitions of [n] having exactly two parity changes within their blocks.

A363588

Number of partitions of [n] having exactly two parity changes within their blocks.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =4a(5) =17a(6) =68a(7) =292a(8) =1252a(9) =5670a(10) =26114a(11) =126073a(12) =621914a(13) =3206277a(14) =16888898a(15) =92771126a(16) =519907322a(17) =3032369590a(18) =18012896770a(19) =111155162265a(20) =697399200274

External references