4,2

The main diagonal of triangle A122890 equals the Catalan numbers (A000108); this is the diagonal immediately below (with leading zeros omitted).

Cf. A122890, A122888; A122887.

Sequence in context: A073391 A002802 A101029 this_sequence A125347 A005465 A037600

Adjacent sequences: A122889 A122890 A122891 this_sequence A122893 A122894 A122895

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Sep 18 2006