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A082448
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Add 1, multiply by 1, add 2, multiply by 2, etc.
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4
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4, 5, 5, 7, 14, 17, 51, 55, 220, 225, 1125, 1131, 6786, 6793, 47551, 47559, 380472, 380481, 3424329, 3424339, 34243390, 34243401, 376677411, 376677423, 4520129076, 4520129089, 58761678157, 58761678171, 822663494394
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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Table of n, a(n) for n=0..28.
Nick Hobson, Python program for this sequence
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FORMULA
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For n>=2, a(2n)=floor((2e+4)*n!)-n-2, a(2n+1)=floor((2e+4)*n!)-1.
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MATHEMATICA
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k = 0; NestList[(k++; {Last@# + k, k(k + Last@#)}) &, {4}, 16] // Flatten
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PROG
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(PARI) a=4; for(n=1, 150, print(a, ", "); b=if(n%2-1, a*ceil(n/2), a+ceil(n/2)); a=b)
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CROSSREFS
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Cf. A019461, A019463, A019460, A019462.
Sequence in context: A110883 A178131 A071570 * A190796 A070783 A198334
Adjacent sequences: A082445 A082446 A082447 * A082449 A082450 A082451
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane, based on a suggestion of Nick MacDonald, Apr 25 2003
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EXTENSIONS
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More terms from Benoit Cloitre, Apr 26 2003
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STATUS
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approved
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