Obverse convolution A000201**A001950; see Comments.
A374863
Obverse convolution A000201**A001950; see Comments.
Terms
- a(0) =0a(1) =2a(2) =45a(3) =840a(4) =23040a(5) =823680a(6) =29729700a(7) =1319205888a(8) =60949324800
External references
- oeis: A374863