Indices of records in A309004.

Terms

a(0) =1a(1) =12a(2) =60a(3) =360a(4) =2520a(5) =27720a(6) =75600a(7) =138600a(8) =831600a(9) =10810800a(10) =75675600a(11) =183783600a(12) =1286485200a(13) =24443218800a(14) =268875406800a(15) =424540116000a(16) =562194032400a(17) =733296564000