Partial sums of A036403.

Terms

a(0) =1a(1) =127a(2) =4054a(3) =37210a(4) =134325a(5) =776241a(6) =1313848a(7) =5536128a(8) =7280823a(9) =28243653a(10) =32246894a(11) =74873810