Sum of logarithmic numbers.

Terms

a(0) =1a(1) =4a(2) =15a(3) =76a(4) =373a(5) =2676a(6) =17539a(7) =152860a(8) =1383561a(9) =14658148a(10) =143131351a(11) =2070738924a(12) =24754959805a(13) =341745565396