A080819 Row sums from triangle in A080818.

1, 4, 9, 16, 16, 25, 36, 36, 49, 64, 81, 81, 100, 121, 121, 144, 169, 196, 196, 225, 256, 256, 289, 324, 361, 361, 400, 441, 441, 484, 529, 529, 576, 625, 676, 676, 729, 784, 784, 841, 900, 961, 961, 1024, 1089, 1089, 1156, 1225, 1225, 1296, 1369, 1444, 1444

Offset

1,2

Links

Table of n, a(n) for n=1..53.

Formula

a(n) = (ceiling(sqrt(n*(n+1)/2)))^2. - C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004

Maple

seq((ceil(sqrt(n*(n+1)/2)))^2, n=1..60); # C. Ronaldo

Crossrefs

Cf. A080817, A080818, A080820.

Sequence in context: A313307 A313308 A248928 * A313309 A313310 A369130

Adjacent sequences: A080816 A080817 A080818 * A080820 A080821 A080822

Keyword

nonn

Author

Amarnath Murthy, Mar 21 2003

Extensions

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004

Status

approved