0,2

f := n->(5*n)!/((2*n)!*(2*n)!*n!);

Sequence in context: A091544 A108091 A036363 this_sequence A115465 A152131 A159993

Adjacent sequences: A001456 A001457 A001458 this_sequence A001460 A001461 A001462

nonn

N. J. A. Sloane (njas(AT)research.att.com).