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A051292 Whitney number of level n of the lattice of the ideals of the crown of size 2 n. +0
7
2, 1, 1, 4, 9, 21, 52, 127, 313, 778, 1941, 4863, 12228, 30837, 77967, 197574, 501657, 1275987, 3250618, 8292703, 21182509, 54169966, 138674031, 355343469, 911347684, 2339226871, 6008781637, 15445521202, 39728258103, 102248793573 (list; graph; listen)
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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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