Seidel's triangle generating A006846 read by rows, T(n,k) for n>=0 and 0<=k<=n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =1a(7) =5a(8) =7a(9) =7a(10) =1a(11) =20a(12) =34a(13) =41a(14) =41a(15) =1a(16) =137a(17) =253a(18) =335a(19) =376a(20) =376a(21) =1a(22) =1478a(23) =2818a(24) =3905a(25) =4657a(26) =5033a(27) =5033a(28) =1a(29) =22925