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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Sequence in context: A322881 A104596 A091743 * A239252 A200736 A287071

Adjacent sequences:  A066618 A066619 A066620 * A066622 A066623 A066624

KEYWORD

easy,nonn,base

AUTHOR

Amarnath Murthy, Dec 25 2001

EXTENSIONS

More terms from Sascha Kurz, Mar 23 2002

STATUS

approved

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Last modified August 9 02:14 EDT 2020. Contains 336310 sequences. (Running on oeis4.)