A288540 Number of Dyck paths of semilength n such that the minimal number of peaks over all positive levels equals one.

1, 0, 2, 5, 13, 35, 112, 368, 1208, 3992, 13449, 46187, 160804, 565535, 2005796, 7168058, 25793100, 93388250, 340005973, 1244062960, 4572478054, 16874672868, 62508259095, 232338076267, 866289458048, 3239350667761, 12145345634715, 45649270140732

Offset: 1

Author

Alois P. Heinz, Jun 11 2017

Keywords

• nonn

Examples

			: a(3) = 2:
:
:          /\    /\
:       /\/  \  /  \/\  .
		

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..300
• Wikipedia, Counting lattice paths

Crossrefs

Column k=1 of A288387.

Cf. A000108.