a(n) = (1/12)*A291391(n).

Terms

a(0) =1a(1) =10a(2) =90a(3) =765a(4) =6264a(5) =49968a(6) =390960a(7) =3013740a(8) =22958640a(9) =173225952a(10) =1296640224a(11) =9640743120a(12) =71270772480a(13) =524277204480