A055134(n,k)*k.

Terms

a(0) =1a(1) =2a(2) =2a(3) =12a(4) =12a(5) =3a(6) =108a(7) =108a(8) =36a(9) =4a(10) =1280a(11) =1280a(12) =480a(13) =80a(14) =5a(15) =18750a(16) =18750a(17) =7500a(18) =1500a(19) =150a(20) =6a(21) =326592a(22) =326592a(23) =136080a(24) =30240a(25) =3780a(26) =252a(27) =7a(28) =6588344a(29) =6588344