Square of the Stirling2 matrix A048993.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =1a(6) =0a(7) =5a(8) =6a(9) =1a(10) =0a(11) =15a(12) =32a(13) =12a(14) =1a(15) =0a(16) =52a(17) =175a(18) =110a(19) =20a(20) =1a(21) =0a(22) =203a(23) =1012a(24) =945a(25) =280a(26) =30a(27) =1a(28) =0a(29) =877