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A085584
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Number of (3412,2341)-, (3412,4123)- and (3412,52341)-avoiding involutions in S_n.
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1, 2, 4, 9, 20, 45, 100, 222, 491, 1086, 2401, 5310, 11744, 25977, 57460, 127101, 281144, 621882, 1375579, 3042726, 6730385, 14887338, 32930188, 72840249, 161119700, 356390301, 788321020, 1743734406, 3857070395, 8531684622
(list; graph; refs; listen; history; internal format)
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