Triangle read by rows: counts permutations by number of big descents.

Terms

a(0) =2a(1) =4a(2) =2a(3) =8a(4) =14a(5) =2a(6) =16a(7) =66a(8) =36a(9) =2a(10) =32a(11) =262a(12) =342a(13) =82a(14) =2a(15) =64a(16) =946a(17) =2416a(18) =1436a(19) =176a(20) =2a(21) =128a(22) =3222a(23) =14394a(24) =16844a(25) =5364a(26) =366a(27) =2a(28) =256a(29) =10562