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..37.
G. Resta, Tridigital Triangular Numbers
Cf. A000217, A119039. See A119034 for a table of cross-references.
Sequence in context: A073119 A002257 A101528 * A135104 A131780 A102006
Adjacent sequences: A119037 A119038 A119039 * A119041 A119042 A119043
Giovanni Resta, May 10 2006