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%I #3 Mar 02 2015 16:08:47
%S 1,1,3,1,5,10,4,11,19,6,16,27,4,17,31,46,11,28,46,65,15,36,58,81,13,
%T 38,64,91,2,31,61,92,124,12,46,81,117,154,16,55,95,136,178,11,55,100,
%U 146,193,241,43,93,144,196,249,16,71,127,184,242,301,31,92,154,217,281,346
%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 pentagonal numbers. The first elements of the rows form a(n).
%Y Cf. A064766, A064865, A065221-A065228, A065230-A065223.
%K easy,nonn
%O 0,3
%A _Floor van Lamoen_, Oct 22 2001
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