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A001521 a(1) = 1; thereafter a(n+1) = [sqrt(2a(n)(a(n)+1))].
(Formerly M0569 N0206)
+0
6
1, 2, 3, 4, 6, 9, 13, 19, 27, 38, 54, 77, 109, 154, 218, 309, 437, 618, 874, 1236, 1748, 2472, 3496, 4944, 6992, 9888, 13984, 19777, 27969, 39554, 55938, 79108, 111876, 158217, 223753, 316435, 447507, 632871, 895015, 1265743, 1790031, 2531486, 3580062, 5062972 (list; graph; listen)
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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