Tenth column (k=9) of sextinomial array A063260.

Terms

a(0) =2a(1) =25a(2) =140a(3) =540a(4) =1666a(5) =4417a(6) =10480a(7) =22825a(8) =46420a(9) =89232a(10) =163592a(11) =288015a(12) =489580a(13) =806990a(14) =1294448a(15) =2026502a(16) =3104030a(17) =4661555a(18) =6876100a(19) =9977814a(20) =14262622a(21) =20107175a(22) =27986400a(23) =38493975a(24) =52366080a(25) =70508802