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18480, 37002, 55524, 74046, 92568, 111090, 129612, 148134, 166656, 185178, 203700, 222222, 240744, 259266, 277788, 296310, 314832, 333354, 351876, 370398, 388920, 407442, 425964, 444486, 463008, 481530, 500052, 518574, 537096, 555618
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OFFSET
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1,1
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COMMENTS
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This is the case s=21 of the identity (2*s^4*n^2-4*s^2*n+1)^2-(s^2*n^2-2*n)*(2*s^3*n-2*s)^2=1. - Bruno Berselli, Feb 05 2011
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LINKS
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FORMULA
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MAPLE
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MATHEMATICA
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PROG
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(Magma) I:=[18480, 37002]; [n le 2 select I[n] else 2*Self(n-1)-Self(n-2): n in [1..40]]; // Vincenzo Librandi, Jan 25 2012
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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