Second column (m=2) of triangle A144886 (S1hat(4)).

A144888

Second column (m=2) of triangle A144886 (S1hat(4)).

Terms

    a(0) =1a(1) =4a(2) =36a(3) =200a(4) =1720a(5) =12480a(6) =118560a(7) =1081920a(8) =11793600a(9) =131443200a(10) =1658764800a(11) =21990528000a(12) =319711795200

External references