Number of skew partitions of n whose diagrams have no empty rows and columns.

Terms

a(0) =1a(1) =1a(2) =3a(3) =9a(4) =28a(5) =87a(6) =272a(7) =850a(8) =2659a(9) =8318a(10) =26025a(11) =81427a(12) =254777a(13) =797175a(14) =2494307a(15) =7804529a(16) =24419909a(17) =76408475a(18) =239077739a(19) =748060606a(20) =2340639096a(21) =7323726778a(22) =22915525377a(23) =71701378526a(24) =224349545236a(25) =701976998795