a(n) = A063997(n)/4.

Terms

a(0) =1a(1) =10a(2) =28a(3) =55a(4) =100a(5) =253a(6) =280a(7) =325a(8) =505a(9) =550a(10) =775a(11) =1000a(12) =2503a(13) =2530a(14) =2575a(15) =2755a(16) =2800a(17) =3025a(18) =3250a(19) =5005a(20) =5050a(21) =5275a(22) =5500a(23) =7525a(24) =7750a(25) =10000a(26) =25003a(27) =25030a(28) =25075a(29) =25255