A symmetrical triangle sequence:t(n,m)=(-1)^m*(n - m)!*Binomial[n - 1, m] + (-1)^(n - m + 1)*(n - (n - m + 1))!*Binomial[n - 1, n - m + 1].

A176862

A symmetrical triangle sequence:t(n,m)=(-1)^m*(n - m)!*Binomial[n - 1, m] + (-1)^(n - m + 1)*(n - (n - m + 1))!*Binomial[n - 1, n - m + 1].

Terms

    a(0) =2a(1) =5a(2) =5a(3) =37a(4) =-16a(5) =37a(6) =239a(7) =-50a(8) =-50a(9) =239a(10) =1801a(11) =-492a(12) =180a(13) =-492a(14) =1801a(15) =15119a(16) =-4186a(17) =714a(18) =714a(19) =-4186a(20) =15119a(21) =141121a(22) =-40336a(23) =8568a(24) =-2688a(25) =8568a(26) =-40336a(27) =141121a(28) =1451519a(29) =-423342

External references