Triangle T(n, k) = 1 if k = 0 or k = n, otherwise n^5 - k^5 - (n-k)^5, read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =30a(5) =1a(6) =1a(7) =210a(8) =210a(9) =1a(10) =1a(11) =780a(12) =960a(13) =780a(14) =1a(15) =1a(16) =2100a(17) =2850a(18) =2850a(19) =2100a(20) =1a(21) =1a(22) =4650a(23) =6720a(24) =7290a(25) =6720a(26) =4650a(27) =1a(28) =1a(29) =9030