Third differences of Bell numbers.

Terms

a(0) =1a(1) =5a(2) =20a(3) =87a(4) =409a(5) =2066a(6) =11155a(7) =64077a(8) =389946a(9) =2504665a(10) =16923381a(11) =119928232a(12) =888980293a(13) =6876320041a(14) =55382419676a(15) =463539664643