The Corner

I Think That I Shall Never See

There is a dedicated band of readers out there who take the same approach to my jottings as Chinese chefs take to the pig: Nothing is wasted.

Here, by way of illustration, is a reader response to my “huh?” in this posting. He actually got a greeting card out of it.

There are apparently 2010 unlabeled, unordered trees with 15 vertices and diameter 7 (the OEIS list starts at 8 vertices, that’s the offset field).

This possibly not terribly exciting fact inspired me to make the attached card, with a small forest of 4 such trees.

Happy New Year!

[Me]  The same to you and yours!

John Derbyshire — Mr. Derbyshire is a former contributing editor of National Review.

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