Sum of degrees of irreducible representations of alternating group A_n.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =16a(5) =46a(6) =126a(7) =448a(8) =1366a(9) =5356a(10) =18568a(11) =76296a(12) =297012a(13) =1264264a(14) =5412928a(15) =23928024a(16) =110468806a(17) =509578384a(18) =2495966844a(19) =12051904744a(20) =61878848596a(21) =312943394336