Euler's triangle: triangle of Eulerian numbers T(n,k) (n>=0, 0 <= k <= n) read by rows.

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =0a(6) =1a(7) =4a(8) =1a(9) =0a(10) =1a(11) =11a(12) =11a(13) =1a(14) =0a(15) =1a(16) =26a(17) =66a(18) =26a(19) =1a(20) =0a(21) =1a(22) =57a(23) =302a(24) =302a(25) =57a(26) =1a(27) =0a(28) =1a(29) =120