# A126900 (b-file synthesized from sequence entry) 0 1 1 18 2 144 3 702 4 2448 5 6786 6 15984 7 33390 8 63648 9 112914 10 189072 11 301950 12 463536 13 688194 14 992880 15 1397358 16 1924416 17 2600082 18 3453840 19 4518846 20 5832144 21 7434882 22 9372528 23 11695086 24 14457312 25 17718930 26 21544848 27 26005374 28 31176432 29 37139778 30 43983216