A277331 a(n) = A253563(A003714(n)).

1, 2, 4, 8, 6, 16, 12, 18, 32, 24, 36, 54, 30, 64, 48, 72, 108, 60, 162, 90, 150, 128, 96, 144, 216, 120, 324, 180, 300, 486, 270, 450, 750, 210, 256, 192, 288, 432, 240, 648, 360, 600, 972, 540, 900, 1500, 420, 1458, 810, 1350, 2250, 630, 3750, 1050, 1470, 512, 384, 576, 864, 480, 1296, 720, 1200, 1944, 1080, 1800, 3000, 840

Offset: 0

Author

Antti Karttunen, Oct 12 2016

Keywords

• nonn

Comments

After the initial terms 1, 2 and 4, all other terms can be inductively generated by applying any finite composition-combination of A253560 and A253550 to 4, but with such a restriction that A253550 may not be applied twice in succession.

A permutation of A055932.

Links

• Antti Karttunen, Table of n, a(n) for n = 0..10946

Crossrefs

Cf. A003714, A055932 (same sequence sorted into ascending order), A253550, A253560, A253563, A122111.

Cf. also A277006, A277332.

Programs

Scheme

(define (A277331 n) (A253563 (A003714 n)))

Formula

a(n) = A253563(A003714(n)).

a(n) = A122111(A277006(n)).