Let K be a local ring with a principal maximal ideal J of nilpotent degree 3 with |K/J|>2; a(n) = number of D-invariant ideals in the ring R_n(K,J).

A221703

Let K be a local ring with a principal maximal ideal J of nilpotent degree 3 with |K/J|>2; a(n) = number of D-invariant ideals in the ring R_n(K,J).

Terms

    a(0) =14a(1) =66a(2) =300a(3) =1326a(4) =5750a(5) =24604a(6) =104268a(7) =438678a(8) =1835260a(9) =7643708a(10) =31719544a(11) =131230924a(12) =541549798a(13) =2229948752a(14) =9165030668a(15) =37606175462a(16) =154083290228a(17) =630512206892

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