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A043301
2^n*Sum_{ k=0..n } (n+k)!/((n-k)!*k!*4^k).
+0
7
1, 3, 13, 77, 591, 5627, 64261, 857901, 13125559, 226566107, 4357258269, 92408688077, 2142828858847, 53940356223483, 1464960933469429, 42699628495507373, 1329548327094606279, 44045893308104036699
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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 6 22:55 EST 2009. Contains 170429 sequences.
AT&T Labs Research
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