A symmetrical triangle:t(n,m)=1 - (1 + n)^(n + 1)* (1 - 1/(n + 1))^(n + 1) + (n + 1)^(n + 2)*Binomial[n, m]((m + 1)/(n + 1))^(m + 1)*(1 - ( m + 1)/(n + 1))^(n - m + 1).

A176390

A symmetrical triangle:t(n,m)=1 - (1 + n)^(n + 1)* (1 - 1/(n + 1))^(n + 1) + (n + 1)^(n + 2)*Binomial[n, m]((m + 1)/(n + 1))^(m + 1)*(1 - ( m + 1)/(n + 1))^(n - m + 1).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =16a(5) =1a(6) =1a(7) =273a(8) =273a(9) =1a(10) =1a(11) =4856a(12) =6246a(13) =4856a(14) =1a(15) =1a(16) =95065a(17) =134785a(18) =134785a(19) =95065a(20) =1a(21) =1a(22) =2073408a(23) =3094575a(24) =3410240a(25) =3094575a(26) =2073408a(27) =1a(28) =1a(29) =50255905

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