The Riordan square of the Euler numbers. Triangle T(n, k), 0 <= k <= n, read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =5a(4) =6a(5) =1a(6) =61a(7) =71a(8) =11a(9) =1a(10) =1385a(11) =1532a(12) =162a(13) =16a(14) =1a(15) =50521a(16) =53901a(17) =3638a(18) =278a(19) =21a(20) =1a(21) =2702765a(22) =2821378a(23) =124723a(24) =6504a(25) =419a(26) =26a(27) =1a(28) =199360981a(29) =205440691