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A026127
a(n) = T(2n-1,n-1), where T is the array in
A026120
.
+0
2
1, 4, 20, 110, 608, 3409, 19304, 110187, 632960, 3654915, 21195716, 123365099, 720240584, 4216176575, 24738092400, 145444454754, 856662911136, 5053815390148, 29857490333880, 176624209891024
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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