A transform of binomial(n,6).

Terms

a(0) =1a(1) =7a(2) =56a(3) =336a(4) =1680a(5) =7392a(6) =29568a(7) =109824a(8) =384384a(9) =1281280a(10) =4100096a(11) =12673024a(12) =38019072a(13) =111132672a(14) =317521920a(15) =889061376a(16) =2444918784a(17) =6615662592a(18) =17641766912a(19) =46425702400a(20) =120706826240a(21) =310388981760a(22) =790081044480