Triangle read by rows: Stirling2 triangle with scaled diagonals (powers of 7).

Terms

a(0) =1a(1) =7a(2) =1a(3) =49a(4) =21a(5) =1a(6) =343a(7) =343a(8) =42a(9) =1a(10) =2401a(11) =5145a(12) =1225a(13) =70a(14) =1a(15) =16807a(16) =74431a(17) =30870a(18) =3185a(19) =105a(20) =1a(21) =117649a(22) =1058841a(23) =722701a(24) =120050a(25) =6860a(26) =147a(27) =1a(28) =823543a(29) =14941423