A025570 a(n) = T(2n,n), where T is the array defined in A025564.

1, 2, 8, 40, 211, 1148, 6369, 35816, 203424, 1164228, 6703372, 38785840, 225325940, 1313494396, 7679038865, 45006411960, 264357297375, 1555762562100, 9171399730944, 54148782940112, 320136500713070, 1895036382245032, 11230166960501463, 66619011999761208, 395563260817743219

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Extensions

More terms from Sean A. Irvine, Sep 07 2019