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A057170 2-enumeration of 2n X 2n half-turn symmetric alternating-sign matrices. +0
1
1, 2, 12, 288, 26880, 10035200, 14836039680, 87734404251648, 2064716402685640704, 194361783607326689722368, 72958995691997968023051829248, 109548594452892660460226753134067712, 656593430123179564638165745256190909087744, 15741504841171021653720624575980053578961033101312 (list; graph; listen)
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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