Weigh transform of the Bell numbers (A000110).

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =21a(5) =78a(6) =305a(7) =1304a(8) =6007a(9) =29854a(10) =159012a(11) =904986a(12) =5479078a(13) =35150263a(14) =238033523a(15) =1695554145a(16) =12663533586a(17) =98881246850a(18) =805128085616