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

1,2

Links

Table of n, a(n) for n=1..25.

Crossrefs

Sequence in context: A076625 A139415 A119817 * A227081 A113449 A234938

Adjacent sequences: A025567 A025568 A025569 * A025571 A025572 A025573

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Sep 07 2019

Status

approved