Triangle read by rows. T(n, k) = binomial(n, k)*(2^k - 1 + 0^k).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =1a(7) =3a(8) =9a(9) =7a(10) =1a(11) =4a(12) =18a(13) =28a(14) =15a(15) =1a(16) =5a(17) =30a(18) =70a(19) =75a(20) =31a(21) =1a(22) =6a(23) =45a(24) =140a(25) =225a(26) =186a(27) =63a(28) =1a(29) =7