OFFSET
2,1
COMMENTS
Included in accordance with OEIS policy of including incorrect sequences to serve as pointers to the correct versions.
LINKS
Williamson, S. G. The combinatorial analysis of patterns and the principle of inclusion-exclusion. Discrete Math. 1 (1972), no. 4, 357--388. MR0299493 (45 #8541)
CROSSREFS
KEYWORD
dead
STATUS
approved