# A036784 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 7 4 25 5 102 6 432 7 1924 8 8808 9 41351 10 197674 11 959589 12 4716069 13 23422164 14 117360162 15 592567469 16 3011916144 17 15398787232 18 79136540960 19 408574756618 20 2118185640135 21 11022473614333 22 57552696735994 23 301434573308538