Main diagonal of the extended Wythoff array (A287870).

Terms

a(0) =0a(1) =3a(2) =6a(3) =15a(4) =32a(5) =60a(6) =118a(7) =212a(8) =398a(9) =733a(10) =1275a(11) =2296a(12) =4092a(13) =6998a(14) =12310a(15) =20905a(16) =36409a(17) =63092a(18) =106266a(19) =182888a(20) =306865a(21) =525175a(22) =896119a(23) =1496319a(24) =2542488a(25) =4310250a(26) =7170549a(27) =12116421a(28) =20119010a(29) =33899511