%I #5 Jun 24 2014 01:10:01
%S 1,2,6,3,9,15,4,12,20,28,5,15,25,35,45,6,18,30,42,54,66,7,21,35,49,63,
%T 77,91,8,24,40,56,72,88,104,120,9,27,45,63,81,99,117,135,153,10,30,50,
%U 70,90,110,130,150,170,190,11,33,55,77,99,121,143,165,187,209,231,12
%N Triangle read by rows: the k-th column is an arithmetic progression with difference 2k-1 and the top entry is the hexagonal number k*(2*k-1) (A000384).
%C The n-th row consists of the odd multiples of n from n*1 to n*(2n-1).
%D R. Honsberger, Ingenuity in Math., Random House, 1970, p. 88.
%F n-th row adds to n^3.
%F a(n, k) = n(2k-1) for 1<=k<=n.
%e Triangle begins:
%e 1
%e 2 6
%e 3 9 15
%e 4 12 20 28
%e 5 15 25 35 45
%e 6 18 30 42 54 66
%t Flatten[Table[n(2k-1), {n, 1, 12}, {k, 1, n}]]
%K nonn,tabl,easy
%O 1,2
%A _N. J. A. Sloane_, Mar 04 2003
%E More terms from _Dean Hickerson_, Apr 06, 2003