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%I #6 Nov 01 2024 15:05:11
%S 1,1,3,6,3,8,14,3,11,20,30,7,19,32,46,6,22,39,57,76,15,36,58,81,105,
%T 18,44,71,99,128,10,41,73,106,140,175,22,59,97,136,176,217,24,67,111,
%U 156,202,249,11,60,110,161,213,266,320,33,89,146,204,263,323,384,43,106
%N Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the heptagonal numbers (A000566). The first elements of the rows form a(n).
%Y Mini-index to these sequences: A064766, A064865, A064866, A065221-A655234 are all of the same type. See A064766 for a detailed explanation.
%K easy,nonn
%O 0,3
%A _Floor van Lamoen_, Oct 22 2001