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A227365 a(n) = 0 + 1*2 + 3*4*5 + 6*7*8*9 + ... + ...*n. 5
0, 1, 2, 5, 14, 62, 68, 104, 398, 3086, 3096, 3196, 4406, 20246, 243326, 243341, 243566, 247406, 316766, 1638686, 28150526, 28150547, 28150988, 28161152, 28405550, 34526126, 193916126, 4503821726, 4503821754, 4503822538, 4503846086, 4504576886, 4527986846, 5301270686 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000

EXAMPLE

a(4) = 0 + 1*2 + 3*4 = 14.

a(5) = 0 + 1*2 + 3*4*5 = 62.

a(6) = 0 + 1*2 + 3*4*5 + 6 = 68.

PROG

(Python)

for n in range(55):

  sum = i = 0

  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), end=', ')

CROSSREFS

Cf. A227363, A227364, A227366, A227367.

Sequence in context: A008286 A049082 A158095 * A059958 A102019 A216270

Adjacent sequences:  A227362 A227363 A227364 * A227366 A227367 A227368

KEYWORD

nonn

AUTHOR

Alex Ratushnyak, Jul 07 2013

STATUS

approved

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Last modified July 29 01:22 EDT 2021. Contains 346340 sequences. (Running on oeis4.)