Number of 10-element subsets of [n] whose sum is a triangular number.

Terms

a(0) =1a(1) =1a(2) =6a(3) =24a(4) =81a(5) =238a(6) =617a(7) =1456a(8) =3192a(9) =6568a(10) =12821a(11) =23921a(12) =42902a(13) =74326a(14) =124878a(15) =204143a(16) =325604a(17) =507933a(18) =776532a(19) =1165523a(20) =1720164a(21) =2499704a(22) =3580966a(23) =5062537a(24) =7069701a(25) =9760408a(26) =13332198a(27) =18030171a(28) =24156438a(29) =32081010