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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.)