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Search: id:A066380
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| 1, 4, 22, 130, 794, 4944, 31180, 198440, 1271626, 8192524, 53009102, 344212906, 2241812648, 14637774688, 95786202688, 628002401520, 4124304597834, 27126202533252, 178651732923346, 1178005033926998, 7776048412324714
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OFFSET
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0,2
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REFERENCES
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R. L. Graham, D. E. Knuth and O. Patashnik, Concrete Mathematics. Addison-Wesley, Reading, MA, 1990, p. 425.
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FORMULA
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a(n) ~ C(3n, n)(2 - 4/n + O(1/n^2)).
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CROSSREFS
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Cf. A032443, A066381.
Sequence in context: A086682 A155862 A088536 this_sequence A007195 A067120 A143648
Adjacent sequences: A066377 A066378 A066379 this_sequence A066381 A066382 A066383
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Dec 23 2001
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