# A147005 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 1 5 3 6 1 7 5 8 1 9 8 10 1 11 60 12 7 13 328 14 21 15 2111 16 77 17 21687 18 479 19 274683 20 3600 21 4419391