Second differences of sequence A160644.

Terms

a(0) =0a(1) =1a(2) =0a(3) =0a(4) =2a(5) =0a(6) =1a(7) =4a(8) =2a(9) =3a(10) =9a(11) =6a(12) =11a(13) =19a(14) =19a(15) =27a(16) =44a(17) =49a(18) =68a(19) =98a(20) =118a(21) =157a(22) =220a(23) =268a(24) =354a(25) =473a(26) =591a(27) =765a(28) =1003a(29) =1254