Triangle read by rows, related to Bell numbers A000110: A216962 interlaced with A216964.

Terms

a(0) =1a(1) =2a(2) =1a(3) =5a(4) =6a(5) =1a(6) =15a(7) =22a(8) =9a(9) =2a(10) =52a(11) =94a(12) =63a(13) =26a(14) =5a(15) =203a(16) =460a(17) =416a(18) =244a(19) =101a(20) =16a(21) =877a(22) =2532a(23) =2741a(24) =2124a(25) =1361a(26) =384a(27) =61a(28) =4140a(29) =15420