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Search: id:A016778
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| 1, 16, 49, 100, 169, 256, 361, 484, 625, 784, 961, 1156, 1369, 1600, 1849, 2116, 2401, 2704, 3025, 3364, 3721, 4096, 4489, 4900, 5329, 5776, 6241, 6724, 7225, 7744, 8281, 8836, 9409, 10000, 10609, 11236
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n)=18*n+a(n-1)-21 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 16 2009]
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EXAMPLE
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For n=2, a(2)=18*2+1-21=16; n=3, a(3)=18*3+16-21=49; n=4, a(4)=18*4+49-21=100 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 16 2009]
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PROGRAM
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(Other) sage: [crt(2, n, 3, 5)^2/4 for n in xrange(2, 38)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 22 2009]
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CROSSREFS
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Sequence in context: A165117 A041496 A059207 this_sequence A009952 A105823 A112630
Adjacent sequences: A016775 A016776 A016777 this_sequence A016779 A016780 A016781
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KEYWORD
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nonn,easy,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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