Triangle in which row n lists the coefficients in Product_{k=1..n} (1 + k*x + x^2), for n>=0, as read by rows.
A249790
Triangle in which row n lists the coefficients in Product_{k=1..n} (1 + k*x + x^2), for n>=0, as read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =4a(7) =3a(8) =1a(9) =1a(10) =6a(11) =14a(12) =18a(13) =14a(14) =6a(15) =1a(16) =1a(17) =10a(18) =39a(19) =80a(20) =100a(21) =80a(22) =39a(23) =10a(24) =1a(25) =1a(26) =15a(27) =90a(28) =285a(29) =539
External references
- oeis: A249790