1,1
G. Resta, Tridigital Triangular Numbers
a(n) = A000217(A119193(n))
Cf. A000217, A119193. See A119033 for a table of cross-references.
Sequence in context: A119061 A197094 A156379 * A103134 A015099 A002818
Adjacent sequences: A119189 A119190 A119191 * A119193 A119194 A119195
nonn,base,more
Giovanni Resta (g.resta(AT)iit.cnr.it), May 10 2006
a(10) from Max Alekseyev (maxale(AT)gmail.com), May 21 2011