Left half of triangle A125053.

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =15a(5) =21a(6) =61a(7) =183a(8) =285a(9) =327a(10) =1385a(11) =4155a(12) =6681a(13) =8475a(14) =9129a(15) =50521a(16) =151563a(17) =247065a(18) =325947a(19) =378105a(20) =396363a(21) =2702765a(22) =8108295a(23) =13311741a(24) =17908935a(25) =21517869a(26) =23823015a(27) =24615741a(28) =199360981a(29) =598082943