OFFSET
0,2
COMMENTS
a(n) is taken to be the smallest number >= a(n-1) which is compatible with the description.
EXAMPLE
Start with 1 in row 1 and form a triangle where row n is generated from row n-1 by the rule given in the description. Then row 2 will have (1) 3, row 3 will have (3) 5's, row 4 will have (5) 7's, (5) 9's and (5) 11's, etc.
The triangle begins:
1;
3;
5,5,5;
7,7,7,7,7,9,9,9,9,9,11,11,11,11,11; ...
The number of terms in each row (also row sums with offset) is given by A113723: [1,1,3,15,135,3845,769605,3821696361,...].
PROG
(PARI) a=[1, 3, 5, 5, 5]; for(n=3, 20, for(i=1, a[n], a=concat(a, 2*n+1))); a
CROSSREFS
KEYWORD
nonn
AUTHOR
Floor van Lamoen and Paul D. Hanna, Nov 08 2005
STATUS
approved