G.f.: (1+62*x+561*x^2+1014*x^3+449*x^4+48*x^5+x^6)/(1-x)^7.

Terms

a(0) =1a(1) =69a(2) =1023a(3) =6761a(4) =28673a(5) =92189a(6) =245463a(7) =570193a(8) =1194577a(9) =2308405a(10) =4180287a(11) =7177017a(12) =11785073a(13) =18634253a(14) =28523447a(15) =42448545a(16) =61632481a(17) =87557413a(18) =121999039a(19) =167063049a(20) =225223713a(21) =299364605a(22) =392821463a(23) =509427185a(24) =653558961