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Search: id:A007558
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| A007558 |
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Shifts 2 places left when e.g.f. is squared.
(Formerly M1230)
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+0
2
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| 1, 1, 1, 2, 4, 10, 30, 100, 380, 1600, 7400, 37400, 204600, 1205600, 7612000, 51260000, 366784000, 2778820000, 22222332000, 187067320000, 1653461480000, 15310662400000, 148217381840000, 1497226615280000
(list; graph; listen)
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