A026156 a(n) = T(2n-1,n), where T is the array in A026148.

1, 4, 20, 111, 616, 3464, 19656, 112370, 646272, 3735324, 21678696, 126256361, 737513400, 4319243760, 25352692620, 149108262264, 878502339712, 5184007871160, 30633757767144, 181253849830625, 1073680925191128, 6366778606697544, 37790436148353900, 224505805610383128

Offset

1,2

Links

Table of n, a(n) for n=1..24.

Crossrefs

Sequence in context: A006770 A158827 A263854 * A025183 A014523 A153299

Adjacent sequences: A026153 A026154 A026155 * A026157 A026158 A026159

Keyword

nonn

Author

Clark Kimberling

Extensions

Offset corrected and more terms from Sean A. Irvine, Sep 18 2019

Status

approved