# A327993 (b-file synthesized from sequence entry) 0 1 1 3 2 7 3 20 4 55 5 151 6 414 7 1133 8 3099 9 8472 10 23155 11 63275 12 172894 13 472393 14 1290663 15 3526256 16 9634071 17 26321031 18 71910814 19 196464677 20 536752579 21 1466437096 22 4006383531 23 10945648019 24 29904074046 25 81699461841 26 223207100431 27 609813170912 28 1666040617711 29 4551707698639