%I A011898
%S A011898 0,0,0,0,1,3,7,13,21,31,45,61,82,107,136,170,210,255,306,
%T A011898 363,427,498,577,664,759,862,975,1096,1228,1370,1522,1685,
%U A011898 1860,2046,2244,2454,2677,2913,3163,3427,3705,3997,4305
%N A011898 [ n(n-1)(n-2)/16 ].
%Y A011898 Sequence in context: A084537 A002061 A063541 this_sequence A098577 A004136 
               A147409
%Y A011898 Adjacent sequences: A011895 A011896 A011897 this_sequence A011899 A011900 
               A011901
%K A011898 nonn,easy
%O A011898 0,6
%A A011898 N. J. A. Sloane (njas(AT)research.att.com).