a(n) = 30240*n^5-25200*n^4+5040*n^3+7320*n^2-2638*n+1.

Terms

a(0) =1a(1) =14763a(2) =628805a(3) =5501167a(4) =24943689a(5) =79549811a(6) =203823373a(7) =449807415a(8) =890712977a(9) =1624547899a(10) =2777745621a(11) =4508793983a(12) =7011864025a(13) =10520438787a(14) =15310942109a(15) =21706367431a(16) =30079906593a(17) =40858578635a(18) =54526858597a(19) =71630306319a(20) =92779195241a(21) =118652141203