A100243 a(n) is the length of a side of triangle A068619(n) or a(n) = (sqrt(8*A068619(n) + 1) - 1)/2.

2, 8, 16, 51, 476, 14851, 1484980, 479637019, 1513291667355

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Crossrefs

Cf. A068619.

Sequence in context: A336127 A076508 A162584 * A026523 A066792 A096195

Adjacent sequences: A100240 A100241 A100242 * A100244 A100245 A100246

Keyword

more,base,nonn

Author

Ray G. Opao, Jan 14 2005

Extensions

Corrected a(5) and added a(6)-a(9) based on updated A068619 by Jesse Sealand, May 24 2019

Status

approved