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1, 76, 1682, 23548, 259723, 2485288, 21707972, 178300904, 1403080725, 10708911188, 79944249686, 587172549764, 4261002128223, 30644790782352, 218917362275080, 1556000598766224, 11017646288488233, 77790282457881756
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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4,2
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REFERENCES
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P. A. MacMahon, The divisors of numbers, Proc. London Math. Soc., (2) 19 (1920), 305-340; Coll. Papers II, pp. 267-302.
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LINKS
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Table of n, a(n) for n=4..21.
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PROG
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(Sage)
r := proc(n, k) option remember;
if n = 0 then if k = 0 then 1 else 0 fi else
(2*(n-k)+1)*r(n-1, k-1) + (2*k+1)*r(n-1, k) fi end:
A060189 := n -> r(n-1, 3): seq(A060189(n), n = 4..21); # Peter Luschny, May 06 2013
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CROSSREFS
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Sequence in context: A163710 A061618 A185819 * A156399 A153177 A166191
Adjacent sequences: A060187 A060188 A060189 * A060191 A060192 A060193
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KEYWORD
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nonn,easy,changed
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AUTHOR
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N. J. A. Sloane, Mar 20 2001
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EXTENSIONS
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More terms from Vladeta Jovovic, Mar 20 2001
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STATUS
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approved
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