a(n) = floor((n+2/3)*(5+sqrt(13))/2); v-pile positions in the 3-Wythoff game.

Terms

a(0) =2a(1) =7a(2) =11a(3) =15a(4) =20a(5) =24a(6) =28a(7) =32a(8) =37a(9) =41a(10) =45a(11) =50a(12) =54a(13) =58a(14) =63a(15) =67a(16) =71a(17) =76a(18) =80a(19) =84a(20) =88a(21) =93a(22) =97a(23) =101a(24) =106a(25) =110a(26) =114a(27) =119a(28) =123a(29) =127