The Beta triangle read by rows.

Terms

a(0) =-1a(1) =-11a(2) =1a(3) =-299a(4) =36a(5) =-1a(6) =-15371a(7) =2063a(8) =-85a(9) =1a(10) =-1285371a(11) =182474a(12) =-8948a(13) =166a(14) =-1a(15) =-159158691a(16) =23364725a(17) =-1265182a(18) =29034a(19) =-287a(20) =1a(21) =-27376820379a(22) =4107797216a(23) =-237180483a(24) =6171928a(25) =-77537a(26) =456a(27) =-1