what to do when you only know a few terms

[N. J. A. Sloane]

PS  Gordon, you said out that over the years it has gotten
harder to use the OEIS for research.  I don't think that is a fair
comment.  The database has increased by a factor of 150 (that's
a multiplicative factor) over the 1995 book.  Yet most searches
are easier now than they ever were.
You can even make very complicated searches trivially
(see the Hints file).

Neil