# A153582 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 9 4 24 5 65 6 177 7 481 8 1308 9 3555 10 9664 11 26269 12 71406 13 194103 14 527625 15 1434235 16 3898654 17 10597641 18 28807374 19 78306562 20 212859305 21 578611580 22 1572829344 23 4275393425 24 11621724256 25 31591121861 26 85873572496 27 233428571660 28 634524644587 29 1724816811090 30 4688538195006 31 12744768177522