Number of set partitions of the multiset consisting of one copy each of x_1, x_2, ..., x_n, and 2 copies each of y_1 and y_2.

A322764

Number of set partitions of the multiset consisting of one copy each of x_1, x_2, ..., x_n, and 2 copies each of y_1 and y_2.

Terms

    a(0) =9a(1) =26a(2) =92a(3) =371a(4) =1663a(5) =8155a(6) =43263a(7) =246218a(8) =1493344a(9) =9600683a(10) =65133513a(11) =464538351a(12) =3471671717a(13) =27109690422a(14) =220646396816

External references