Let p = n-th odd prime; a(n) = class number h = h- * h+ of cyclotomic field Q( exp(2 P i / p) ).
1, 1, 1, 1, 1, 1, 1, 3, 8, 9, 37, 121, 211, 695, 4889, 41241, 76301, 853513, 3882809
1 seqfan posts
Thu Feb 5 22:44:07 CET 2009 [seqfan] A061653 corrected!