login
A066621
Concatenation of triangular numbers in increasing order up to the n-th and then in decreasing order.
0
1, 131, 13631, 13610631, 136101510631, 1361015211510631, 13610152128211510631, 136101521283628211510631, 1361015212836453628211510631, 13610152128364555453628211510631
OFFSET
1,2
CROSSREFS
Sequence in context: A322881 A104596 A091743 * A239252 A200736 A287071
KEYWORD
easy,nonn,base
AUTHOR
Amarnath Murthy, Dec 25 2001
EXTENSIONS
More terms from Sascha Kurz, Mar 23 2002
STATUS
approved