OFFSET
0,5
LINKS
T. S. Motzkin, Sorting numbers for cylinders and other classification numbers, in Combinatorics, Proc. Symp. Pure Math. 19, AMS, 1971, pp. 167-176 (p. 172, gives a(9) incorrectly as 6; it should be 7). [Annotated, scanned copy]
CROSSREFS
KEYWORD
dead
STATUS
approved