Odd squares: (2n+1)^2. Also centered octagonal numbers.
1, 9, 25, 49, 81, 121, 169, 225, 289, 361, 441, 529, 625, 729, 841, 961, 1089, 1225
2 seqfan posts
Thu Dec 2 18:16:11 CET 2010 [seqfan] Re: Trotter Math
Sun Jun 28 21:34:47 CEST 2009 [seqfan] Re: A161984: obscure definition
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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