Records in A171868 (positions).

Terms

a(0) =1a(1) =2a(2) =4a(3) =9a(4) =20a(5) =50a(6) =147a(7) =269a(8) =992a(9) =1000a(10) =4297a(11) =76468a(12) =97314a(13) =445519a(14) =1315337a(15) =2594742a(16) =3888902a(17) =91859035a(18) =92411466a(19) =1180624310a(20) =4501485474a(21) =11288114818a(22) =23434425843