Number of sequences of length n over {1, -1} with Erdős discrepancy <= 2.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =18a(6) =28a(7) =44a(8) =88a(9) =100a(10) =152a(11) =240a(12) =370a(13) =556a(14) =882a(15) =750a(16) =1500a(17) =2250a(18) =2784a(19) =4284a(20) =6438a(21) =6062a(22) =9526a(23) =14856a(24) =22944a(25) =26164a(26) =39528a(27) =35122a(28) =54800a(29) =80940