A symmetrical triangle sequence:q=3;c(n,q)=Product[1 - q^i, {i, 1, n}];t(n,m,q)=-Eulerian[n + 1, m] + 2*c(n, q)/(c(m, q)*c(n - m, q)).

A176428

A symmetrical triangle sequence:q=3;c(n,q)=Product[1 - q^i, {i, 1, n}];t(n,m,q)=-Eulerian[n + 1, m] + 2*c(n, q)/(c(m, q)*c(n - m, q)).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =15a(8) =15a(9) =1a(10) =1a(11) =54a(12) =194a(13) =54a(14) =1a(15) =1a(16) =185a(17) =2118a(18) =2118a(19) =185a(20) =1a(21) =1a(22) =608a(23) =20831a(24) =65344a(25) =20831a(26) =608a(27) =1a(28) =1a(29) =1939

External references