# A071738 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 19 5 62 6 207 7 704 8 2431 9 8502 10 30056 11 107236 12 385662 13 1396652 14 5088865 15 18642420 16 68624295 17 253706790 18 941630580 19 3507232740 20 13105289370 21 49114150020 22 184560753390 23 695267483664 24 2625197720454 25 9933364416572