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A026156
a(n) = T(2n-1,n), where T is the array in
A026148
.
+0
1
1, 4, 20, 111, 616, 3464, 19656, 112370, 646272, 3735324, 21678696, 126256361, 737513400, 4319243760, 25352692620, 149108262264, 878502339712, 5184007871160, 30633757767144, 181253849830625
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.
AT&T Labs Research
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