a(n) = binomial(n+6,n)*binomial(n+10,n).

Terms

a(0) =1a(1) =77a(2) =1848a(3) =24024a(4) =210210a(5) =1387386a(6) =7399392a(7) =33372768a(8) =131405274a(9) =462351890a(10) =1479526048a(11) =4365213216a(12) =12004336344a(13) =31040798712a(14) =76018282560a(15) =177375992640a(16) =396324483555a(17) =851617661895