# A046847 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 6 5 30 6 32 7 42 8 120 9 210 10 248 11 284 12 574 13 600 14 628 15 1600 16 2800 17 3396 18 8892 19 9426 20 14630 21 15444 22 37384 23 51062 24 76364 25 129566