Triangle of coefficients in expansion of (1+10x)^n.

Terms

a(0) =1a(1) =1a(2) =10a(3) =1a(4) =20a(5) =100a(6) =1a(7) =30a(8) =300a(9) =1000a(10) =1a(11) =40a(12) =600a(13) =4000a(14) =10000a(15) =1a(16) =50a(17) =1000a(18) =10000a(19) =50000a(20) =100000a(21) =1a(22) =60a(23) =1500a(24) =20000a(25) =150000a(26) =600000a(27) =1000000a(28) =1a(29) =70