Number of solutions to a+b+c = d+e+f with 0 < a <= n, 0 <= b,c,d,e,f <= n.

Terms

a(0) =0a(1) =10a(2) =96a(3) =445a(4) =1431a(5) =3681a(6) =8141a(7) =16142a(8) =29466a(9) =50412a(10) =81862a(11) =127347a(12) =191113a(13) =278187a(14) =394443a(15) =546668a(16) =742628a(17) =991134a(18) =1302108a(19) =1686649a(20) =2157099a(21) =2727109a(22) =3411705a(23) =4227354a(24) =5192030a(25) =6325280a(26) =7648290a(27) =9183951a(28) =10956925a(29) =12993711