Number of partitions of an n-set without blocks of size 9.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =52a(6) =203a(7) =877a(8) =4140a(9) =21146a(10) =115965a(11) =678460a(12) =4212497a(13) =27633712a(14) =190795218a(15) =1381942530a(16) =10470109267a(17) =82764226404a(18) =681048663329