Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".
Table of n, a(n) for n=1..53.
a(n)=(ceil(sqrt(n*(n+1)/2)))^2 - C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004
seq((ceil(sqrt(n*(n+1)/2)))^2, n=1..60); (C. Ronaldo)
Cf. A080817, A080818, A080820.
Sequence in context: A054580 A165488 A248928 * A233457 A010393 A010425
Adjacent sequences: A080816 A080817 A080818 * A080820 A080821 A080822
Amarnath Murthy, Mar 21 2003
More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004