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A006054 a(n)=2a(n-1)+a(n-2)-a(n-3).
(Formerly M1396)
+0
21
0, 0, 1, 2, 5, 11, 25, 56, 126, 283, 636, 1429, 3211, 7215, 16212, 36428, 81853, 183922, 413269, 928607, 2086561, 4688460, 10534874, 23671647, 53189708, 119516189, 268550439, 603427359, 1355888968, 3046654856, 6845771321, 15382308530 (list; graph; listen)
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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.


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