Binomial coefficients C(2*n+4,4).

Terms

a(0) =1a(1) =15a(2) =70a(3) =210a(4) =495a(5) =1001a(6) =1820a(7) =3060a(8) =4845a(9) =7315a(10) =10626a(11) =14950a(12) =20475a(13) =27405a(14) =35960a(15) =46376a(16) =58905a(17) =73815a(18) =91390a(19) =111930a(20) =135751a(21) =163185a(22) =194580a(23) =230300a(24) =270725a(25) =316251a(26) =367290a(27) =424270a(28) =487635a(29) =557845