a(n) = binomial(n+4,4) * binomial(n+8,4).

Terms

a(0) =70a(1) =630a(2) =3150a(3) =11550a(4) =34650a(5) =90090a(6) =210210a(7) =450450a(8) =900900a(9) =1701700a(10) =3063060a(11) =5290740a(12) =8817900a(13) =14244300a(14) =22383900a(15) =34321980a(16) =51482970a(17) =75710250a(18) =109359250a(19) =155405250a(20) =217567350a(21) =300450150a(22) =409704750a(23) =552210750a(24) =736281000a(25) =971890920a(26) =1270934280a(27) =1647507400a(28) =2118223800