Triangle of coefficients in expansion of (1+11x)^n.

Terms

a(0) =1a(1) =1a(2) =11a(3) =1a(4) =22a(5) =121a(6) =1a(7) =33a(8) =363a(9) =1331a(10) =1a(11) =44a(12) =726a(13) =5324a(14) =14641a(15) =1a(16) =55a(17) =1210a(18) =13310a(19) =73205a(20) =161051a(21) =1a(22) =66a(23) =1815a(24) =26620a(25) =219615a(26) =966306a(27) =1771561a(28) =1a(29) =77