Triangle read by rows: row sums, right and left borders are the Bell sequence, or a shifted variant. See Comments for precise definition.

A212431

Triangle read by rows: row sums, right and left borders are the Bell sequence, or a shifted variant. See Comments for precise definition.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =2a(6) =5a(7) =3a(8) =2a(9) =5a(10) =15a(11) =9a(12) =8a(13) =5a(14) =15a(15) =52a(16) =31a(17) =28a(18) =25a(19) =15a(20) =52a(21) =203a(22) =121a(23) =108a(24) =100a(25) =90a(26) =52a(27) =203a(28) =877a(29) =523

External references