G.f.: (1+62*x+569*x^2+1086*x^3+521*x^4+56*x^5+x^6)/(1-x)^7.

Terms

a(0) =1a(1) =69a(2) =1031a(3) =6889a(4) =29473a(5) =95389a(6) =255263a(7) =595281a(8) =1251025a(9) =2423605a(10) =4398087a(11) =7564217a(12) =12439441a(13) =19694221a(14) =30179647a(15) =44957345a(16) =65331681a(17) =92884261a(18) =129510727a(19) =177459849a(20) =239374913a(21) =318337405a(22) =417912991a(23) =542199793a(24) =695878961