Binomial coefficients C(2*n-5,6).

Terms

a(0) =7a(1) =84a(2) =462a(3) =1716a(4) =5005a(5) =12376a(6) =27132a(7) =54264a(8) =100947a(9) =177100a(10) =296010a(11) =475020a(12) =736281a(13) =1107568a(14) =1623160a(15) =2324784a(16) =3262623a(17) =4496388a(18) =6096454a(19) =8145060a(20) =10737573a(21) =13983816a(22) =18009460a(23) =22957480a(24) =28989675a(25) =36288252a(26) =45057474a(27) =55525372a(28) =67945521a(29) =82598880