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A227364
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a(n) = 1 + 2*3 + 4*5*6 + 7*8*9*10 + ... + ...*n (see Example lines).
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5
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0, 1, 3, 7, 11, 27, 127, 134, 183, 631, 5167, 5178, 5299, 6883, 29191, 365527, 365543, 365799, 370423, 458551, 2226007, 39435607, 39435629, 39436113, 39447751, 39739207, 47329207, 252562807, 6006997207, 6006997236, 6006998077, 6007024177, 6007860247, 6035477527, 6975328087
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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Seiichi Manyama, Table of n, a(n) for n = 0..10000
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EXAMPLE
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a(5) = 1 + 2*3 + 4*5 = 27;
a(6) = 1 + 2*3 + 4*5*6 = 127;
a(7) = 1 + 2*3 + 4*5*6 + 7 = 134.
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PROG
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(Python)
for n in range(55):
sum = 0
i = k = 1
while i<=n:
product = 1
for x in range(k):
product *= i
i += 1
if i>n: break
sum += product
k += 1
print str(sum)+', ',
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CROSSREFS
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Cf. A227363, A227365, A227366, A227367, A228958.
Sequence in context: A001645 A103798 A093361 * A051202 A211674 A035095
Adjacent sequences: A227361 A227362 A227363 * A227365 A227366 A227367
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KEYWORD
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nonn
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AUTHOR
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Alex Ratushnyak, Jul 07 2013
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STATUS
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approved
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