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(Python)
A181391_list, A171887_list, l, r, k = [0, 0], [1], 0, 1, 1
for n in range(1, 10**6):
....for m in range(n-1, -1, -1):
........if A181391_list[m] == A181391_list[n]:
............A181391_list.append(n-m)
............break
....else:
........A181391_list.append(0)
........k += 1
........if n-l > r:
............r = n-l
............A171887_list.append(k)
........l = n # Chai Wah Wu, Jan 02 2015
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