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Search: id:A001475
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| A001475 |
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a(n) = a(n-1) + n a(n-2). (Formerly M1449 N0573)
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+0 3
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| 1, 2, 5, 13, 38, 116, 382, 1310, 4748, 17848, 70076, 284252, 1195240, 5174768, 23103368, 105899656, 498656912, 2404850720, 11879332048, 59976346448
(list; graph; listen)
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