a(n) = n*a(n-1) - a(n-2) + a([n/2]), where a(0) = 1, a(1) = 1, a(2) = 1.

A298419

a(n) = n*a(n-1) - a(n-2) + a([n/2]), where a(0) = 1, a(1) = 1, a(2) = 1.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =12a(5) =58a(6) =339a(7) =2318a(8) =18217a(9) =161647a(10) =1598311a(11) =17419832a(12) =207440012a(13) =2679300663a(14) =37302771588a(15) =556862275475

External references