1418560

Appears in sequences

• Nonuple factorial, 9-factorial, n!9, n!!!!!!!!!.at n=40A114806
• Partial products of successive terms of A017209; a(0)=1 .at n=5A144829
• Square table read by downward antidiagonals: n-th row has e.g.f. (1-9*x)^(-n/9).at n=49A392037