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%I
%S 1,1,2,3,4,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,
%T 2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,
%U 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28
%N Fill a triangular array by rows by writing numbers 1, then 1 up to 2^2, then 1 up to 3^2, then 1 up to 4^2 and so on.
%e The triangle begins:
%e ....1
%e ...1.2
%e ..3.4.1
%e .2.3.4.5
%e 6.7.8.9.1
%Y Cf. A064865.
%K easy,nonn,tabl
%O 1,3
%A Floor van Lamoen (fvlamoen(AT)hotmail.com), Oct 08 2001
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