%I A015221
%S A015221 1,5,55,91,285,385,819,1015,1785,2109,3311,3795,5525,6201,8555,9455,
%T A015221 12529,13685,17575,19019,23821,25585,31395,33511,40425,42925,51039,
%U A015221 53955,63365,66729,77531,81375,93665,98021,111895,116795,132349,137825
%N A015221 Odd square pyramidal numbers.
%F A015221 Odd numbers of the form n(n+1)(2n+1)/6.
%Y A015221 Sequence in context: A132619 A085719 A129420 this_sequence A035305 A057722 
               A078216
%Y A015221 Adjacent sequences: A015218 A015219 A015220 this_sequence A015222 A015223 
               A015224
%K A015221 nonn,easy
%O A015221 0,2
%A A015221 Mohammad K. Azarian (ma3(AT)evansville.edu)
%E A015221 More terms from Erich Friedman (erich.friedman(AT)stetson.edu).