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A026156
a(n) = T(2n-1,n), where T is the array in A026148.
0
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
CROSSREFS
Sequence in context: A006770 A158827 A263854 * A025183 A014523 A153299
KEYWORD
nonn
EXTENSIONS
Offset corrected and more terms from Sean A. Irvine, Sep 18 2019
STATUS
approved