> (not yet thoroughly checked)
> 1 1 1 4 28 550 28456 4134861
We agree: I get
1 1 1 4 28 550 28456 4134861 1781622569
Natural logarithms suggest a growth rate of the sequence:
0 0 0 1.4 3.3 6.3 10.3 15.2 21.3
and we all recognize the triangular numbers.
The next number should be around 1e12 or 2e12;
my bit-twiddler won't count those anytime soon.
--
Don Reble djr at nk.ca