# A156528 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 2 4 9 5 35 6 6 7 38 8 181 9 735 10 24 11 202 12 1148 13 5395 14 22449 15 120 16 1284 17 8560 18 45832 19 213529 20 902055 21 720 22 9468 23 73052 24 440516 25 2275270 26 10540509 27 44990231 28 5040 29 79344 30 700380 31 4713740 32 26783190 33 135134070 34 623527389 35 2681453775 36 40320