Let K be a local ring with a principal maximal ideal J of nilpotent degree 2 with |K/J|>2; a(n) = number of D-invariant ideals in the ring R_n(K,J).

A221701

Let K be a local ring with a principal maximal ideal J of nilpotent degree 2 with |K/J|>2; a(n) = number of D-invariant ideals in the ring R_n(K,J).

Terms

    a(0) =8a(1) =36a(2) =160a(3) =696a(4) =2978a(5) =12592a(6) =52788a(7) =219888a(8) =911480a(9) =3763832a(10) =15494608a(11) =63627024a(12) =260733598a(13) =1066567352a(14) =4356387548a(15) =17770522592a(16) =72407072528a(17) =294732200792

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