Triangle T(n, k) = (f(k, n-k+1) + f(n-k+1, k))/2 where f(n, k) = (1/2)*Sum_{j=1..2*n} k^j, read by rows.

A173567

Triangle T(n, k) = (f(k, n-k+1) + f(n-k+1, k))/2 where f(n, k) = (1/2)*Sum_{j=1..2*n} k^j, read by rows.

Terms

    a(0) =2a(1) =5a(2) =5a(3) =9a(4) =30a(5) =9a(6) =14a(7) =123a(8) =123a(9) =14a(10) =20a(11) =425a(12) =1092a(13) =425a(14) =20a(15) =27a(16) =1413a(17) =7650a(18) =7650a(19) =1413a(20) =27a(21) =35a(22) =4872a(23) =54051a(24) =87380a(25) =54051a(26) =4872a(27) =35a(28) =44a(29) =17783

External references