# A124495 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 8 5 14 6 43 7 81 8 283 9 556 10 2243 11 4512 12 21374 13 43469 14 243817 15 497217 16 3289606 17 6697795 18 51583952 19 104698998 20 922789643 21 1867079621 22 18522929815 23 37380015420 24 411572179999 25 828925168492 26 10014624164666 27 20140445929353