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A237587
Triangle read by rows in which row n lists the first n odd squares in decreasing order.
0
1, 9, 1, 25, 9, 1, 49, 25, 9, 1, 81, 49, 25, 9, 1, 121, 81, 49, 25, 9, 1, 169, 121, 81, 49, 25, 9, 1, 225, 169, 121, 81, 49, 25, 9, 1, 289, 225, 169, 121, 81, 49, 25, 9, 1, 361, 289, 225, 169, 121, 81, 49, 25, 9, 1, 441, 361, 289, 225, 169, 121, 81, 49, 25, 9, 1
OFFSET
1,2
COMMENTS
The sum of row n gives A000447(n).
The alternatig sum of row n gives A077221(n).
FORMULA
T(n,k) = (2*(n-k+1)-1)^2, n >=1, 1<=k<=n.
EXAMPLE
Triangle begins:
1;
9, 1;
25, 9, 1;
49, 25, 9, 1;
81, 49, 25, 9, 1;
121, 81, 49, 25, 9, 1;
169, 121, 81, 49, 25, 9, 1;
225, 169, 121, 81, 49, 25, 9, 1;
289, 225, 169, 121, 81, 49, 25, 9, 1;
361, 289, 225, 169, 121, 81, 49, 25, 9, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Omar E. Pol, Feb 16 2014
STATUS
approved