Triangle T(n, k) = 28^(k*(n-k)), read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =28a(5) =1a(6) =1a(7) =784a(8) =784a(9) =1a(10) =1a(11) =21952a(12) =614656a(13) =21952a(14) =1a(15) =1a(16) =614656a(17) =481890304a(18) =481890304a(19) =614656a(20) =1a(21) =1a(22) =17210368a(23) =377801998336a(25) =377801998336a(26) =17210368a(27) =1a(28) =1a(29) =481890304a(34) =481890304