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A001631 Tetranacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) +a(n-4).
(Formerly M1081 N0410)
+0
3
0, 0, 1, 0, 1, 2, 4, 7, 14, 27, 52, 100, 193, 372, 717, 1382, 2664, 5135, 9898, 19079, 36776, 70888, 136641, 263384, 507689, 978602, 1886316, 3635991, 7008598, 13509507, 26040412, 50194508, 96753025, 186497452, 359485397, 692930382 (list; graph; listen)
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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.


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