70109

Appears in sequences

• Number of sum-free subsets of {1, ..., n}.at n=25A007865
• Odd terms of A059756.at n=37A111042
• The first lower diagonal in square array A137570; equals the convolution of the main diagonal A137571 with the Catalan numbers (A000108) and with the square of A002293.at n=6A137573