A099933 Main diagonal of array A007754.

1, 2, 11, 110, 1555, 28248, 626219, 16383796, 494052001, 16870035070, 643387631279, 27105962133498, 1250204513874499, 62655598615243340, 3390311968553510615, 196993431796981792712, 12233255754813946704001, 808560048188371962179034, 56672826844096496885966099

Offset: 0

Author

Ralf Stephan, Nov 06 2004

Keywords

• nonn

Crossrefs

Cf. A007754.

Formula

a(n) = A007754(n,n).