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A306185
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a(n) = (2n+1)!! + (2n)!! where k!! = A006882(k).
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1
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5, 23, 153, 1329, 14235, 181215, 2672145, 44781345, 840523635, 17465201775, 397983749625, 9867844134225, 264469801070475, 7618612476650175, 234748657653134625, 7703855828862818625, 268263758052098683875, 9879138385352252391375, 383608053176023482431625, 15664153113813817068080625
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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FORMULA
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EXAMPLE
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PROG
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(Python)
o=e=1
for n in range(2, 99, 2):
o*=n+1
e*=n
print str(o+e)+', ',
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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