Lucky numbers (A000959) at which records in first differences (A031883) occur.

Terms

a(0) =1a(1) =3a(2) =15a(3) =51a(4) =171a(5) =745a(6) =1057a(7) =3507a(8) =23205a(9) =50779a(10) =51475a(11) =97113a(12) =241887a(13) =593727a(14) =636291a(15) =1661215a(16) =6010095a(17) =6100953a(18) =8825911a(19) =22032619a(20) =24058237a(21) =71730273a(22) =84577003a(23) =98797723a(24) =119871675a(25) =255510487a(26) =380154649a(27) =404917765a(28) =704823889a(29) =910302427