Number of non-squashing partitions of {1,...,n}.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =14a(5) =26a(6) =107a(7) =190a(8) =1234a(9) =2182a(10) =9947a(11) =17414a(12) =126953a(13) =228398a(14) =1039404a(15) =1857419a(16) =19047146a(17) =35215110a(18) =168364007a(19) =307674658a(20) =2378963269a(21) =4429446046a(22) =20237375204a(23) =37371654467a(24) =410117798653a(25) =776233491226