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A056128
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A second order recursive sequence.
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1
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1, 20, 174, 988, 4277, 15288, 47320, 130832, 330174, 772616, 1696396, 3527160, 6995534, 13312768, 24426552, 43385360, 74847175, 125777340, 206390730, 331405620, 521690715, 806403000, 1225732560, 1834391520, 2706007980, 3938612496, 5661434520, 8043259504
(list;
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refs;
listen;
history;
text;
internal format)
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