Base 7 digital convolution sequence.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =120a(8) =840a(9) =1800a(10) =6240a(11) =26760a(12) =140040a(13) =867000a(14) =280080a(15) =2014080a(16) =4588320a(17) =17793120a(18) =80349120a(19) =437331840a(20) =2784689280a(21) =1311995520a(22) =9666063360a(23) =23268113280a(24) =98802529920a(25) =465014459520