%I A015220
%S A015220 4,10,20,56,84,120,220,286,364,560,680,816,1140,1330,1540,2024,2300,
%T A015220 2600,3276,3654,4060,4960,5456,5984,7140,7770,8436,9880,10660,11480,
%U A015220 13244,14190,15180,17296,18424,19600,22100,23426,24804,27720,29260
%N A015220 Even tetrahedral numbers.
%Y A015220 Cf. A000292.
%Y A015220 Sequence in context: A020149 A056412 A032275 this_sequence A047199 A038065 
               A038422
%Y A015220 Adjacent sequences: A015217 A015218 A015219 this_sequence A015221 A015222 
               A015223
%K A015220 nonn,easy
%O A015220 0,1
%A A015220 Mohammad K. Azarian (ma3(AT)evansville.edu)
%E A015220 More terms from Erich Friedman (erich.friedman(AT)stetson.edu).