Triangle of 3-Eulerian numbers.

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =10a(5) =9a(6) =1a(7) =25a(8) =67a(9) =27a(10) =1a(11) =56a(12) =326a(13) =376a(14) =81a(15) =1a(16) =119a(17) =1314a(18) =3134a(19) =1909a(20) =243a(21) =1a(22) =246a(23) =4775a(24) =20420a(25) =25215a(26) =9094a(27) =729a(28) =1a(29) =501