Number of vectors abcdefg with a,b,... >= 0, a+...+g=n, a>={b,...g}.

Terms

a(0) =1a(1) =1a(2) =7a(3) =22a(4) =48a(5) =93a(6) =180a(7) =331a(8) =567a(9) =918a(10) =1434a(11) =2180a(12) =3232a(13) =4669a(14) =6596a(15) =9142a(16) =12459a(17) =16725a(18) =22148a(19) =28960a(20) =37428a(21) =47860a(22) =60612a(23) =76079a(24) =94702a(25) =116970a(26) =143438a(27) =174721a(28) =211489a(29) =254481