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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