# A165546 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 22 5 90 6 395 7 1823 8 8741 9 43193 10 218704 11 1129944 12 5937728 13 31656472 14 170892498 15 932625326 16 5138618526 17 28554124650 18 159874462032 19 901243508380 20 5111776163584 21 29155580007964 22 167139065156182 23 962618219420046